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{{Location Infobox
|image=FileTest shaft 09 signage.png|250px
|image2=
|name=Test Shaft 09 ("Zulu Bunsen")
|constructed=1953-1986
|destroyed=
|location=Enrichment Shafts
|builder=
|era=''Portal 2''
|affiliation=Aperture Science
|maps=*sp_a3_00
*sp_a3_01
*sp_a3_03
*sp_a3_jump_intro
*sp_a3_bomb_flings
*sp_a3_crazy_box
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*sp_a3_speed_ramp
*sp_a3_speed_flings
*sp_a3_portal_intro
*sp_a3_end
|designer=*Laura Dubuk (50s concept art)http//store.valvesoftware.com/product.php?i=P2233 Aperture Laboratories lithograph by Laura Dubuk at the Valve Store
*Eric Kirchmer (70s concept art)http//ericskirchmer.blogspot.com/2010/10/past-websites-that-never-were.html Eric Kirchmer's Blogger
|hidei=
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}}
{{Quote|All these science spheres are made out of asbestos, by the way. Keeps out the rats. Let us know if you feel a shortness of breath, a persistent dry cough, or your heart stopping. Because that's not part of the test. That's asbestos.|Cave Johnson|Portal 2}}
'''Test Shaft 09''', codenamed "'''Zulu Bunsen'''," is the last in a group of nine Enrichment Shafts located in the salt mine above which the modern Aperture Science Enrichment Center is built.
Reaching lower than 4375 m up from the deepest parts of the mine, it is the main location of the ''Portal 2'' chapters ''Portal 2 storyline Fall|The Fall'' and ''Portal 2 storyline Reunion|The Reunion''.
Test Shaft 09 can be considered as a "timeline" level, as it reveals many details about Aperture Science's background and evolution, from its establishment in the late 1940s to some time before the end of the pre-GLaDOS era, in the late 1980s, through explicit visuals and the recorded messages by Cave Johnson and occasionally his assistant Caroline.
==Overview==
FileUnderground oldportalgun.png|200px|right|thumb|Sign used in the first Enrichment Sphere featuring an early Handheld Portal Device.
As part of the Enrichment Shafts built in the immense salt mine purchased by Cave Johnson in 1944, Test Shaft 09 was used to test several experiments from the early 1950s to the late 1980s, many being described by Johnson through prerecorded interphone messages, not necessarily involving teleportation, often with ominous results, and spread through six Enrichment Spheres (the seventh apparently not used), as well as several other unseen Test Chambers
*In the Enrichment Spheres Experiments with the Mobility Gels (in the Co-op Test Shaft as well) coupled with prototypes of the Handheld Portal Device, from the 50s to the 80s. Testing starts in a 50s area at the bottom of the Shaft and goes ascending in height as well as time to end up in the 80s, then finally the modern facility again. Thus during the ~35 years of building of the Shaft, each area was left as it was when built and never modernized when the next area was completed.
*In the condemned Test Chambers near the 50s reception area
*Injection of praying mantis DNA to Test Subjects, turning them into Mantis Men. This test was later postponed indefinitely, to be replaced with another test fighting an army of mantis men.
*Firing of an invisible laser at test subjects, resulting in their blood being turned into pure gasoline.
*The transformation of test subjects' excrement into coal.
*Pointing a superconductor at full power at test subjects, with no particular goal in mind. Cave Johnson remarks that in this case, they're simply "throwing science at the wall and seeing what sticks", and notes that the best-case scenario is the test subject gaining superpowers, whereas the worst-case scenario is the subject growing a number of tumours, which Johnson promises to have removed.
*FilePortal2 2011-05-28 21-39-35-48.jpg|200px|right|thumb|The access to the ''Borealis''’ drydock from the 70s Test Chambers corridor.In the Test Chambers near the 70s reception area
*Temporary replacement of test subjects' blood with peanut water. Cave Johnson notes that this experiment poses problems to subjects allergic to peanuts, but also states that should the test succeed, they'll have to invent a new type of Nobel Prize to award them.
*Exposing test subjects to jet engine exhaust, with a view to reducing subjects' body water percentage from 60% (a total Johnson deems "excessive") to around 20% or 30%.
*Teleportation experiment which may result in test subjects being separated from their skin. Before the test, test subjects are asked to remember which skin is theirs, and should said accident happen they are promised to be sewn right back into it.
*Unknown experiment in the icebreaker ''Borealis'' in a large drydock located near the previous Test Chambers, which made the ship disappear and reappear in an Arctic region.
FileUnderground condemned01.png|150px|left|thumb|The condemnation order.
On Timeline of the Half-Life universe 15|June 15, 1961, Test Shaft 09 was condemned by WikipediaVitrification|vitrification when it was filled with unsafe quantities of cosmic ray spallation elements, until it was reopened in the early 1970s, to be used until the late 1980s. Anyone entering the area is warned to not look at, touch, ingest or engage conversation with any substances located beyond. In the 1990s, Cave Johnson is dead, access to the Mobility Gel supply is cut off, and the Enrichment Shafts are apparently disused, the main facility above, eventually supervised by GLaDOS, being used instead for testing.
As the Enrichment Shafts date from before GLaDOS' activation, she never monitored them before discovering Test Shaft 09 with Chell. Instead, prerecorded messages from Aperture CEO Cave Johnson and occasionally his assistant Caroline are used to guide Test Subjects.
==Features==
What follows is a summary of Test Shaft 09's features. For the detailed layout, see .
===Access===
FilePortal2 2011-07-03 13-48-22-35.jpg|200px|right|thumb|The Abandonment Hatch before being opened by Chell.
Test Shaft 09 has several known accesses
*The Main Lift that connects each level to the surface, that was to be used by Test Subjects. Each level appears to be isolated from the other by a couple of horizontal sliding blast doors on each side of the elevator shaft covering the area.
*Two gargantuan hatches located at each end the Abandonment Hatch, accessed by Chell from the "Tartaros" area at the very bottom, and the Transition Seal 02, located at the very top, leading to the modern facility and through which the Mobility Gel flow feeds into the facility.
*An underground train network connected to the eight other Test Shafts, located at the very bottom of the Shaft series.
===Reception and control complexes===
FilePortal2 2011-04-25 22-57-44-06.jpg|200px|left|thumb|The 50s Lobby.
Test Shaft 09 contains several complexes dedicated to office space, reception for Test Subjects, and access control to the Enrichment Spheres. These complexes can be distinguished by era the reception complex for the Repulsion Gel spheres was completed in the early 1950s and reflects a time when Aperture (at that time marketing its products as "Aperture Science Innovators") was able to attract the best and brightest to test its exotic technologies. Instructional posters, Johnson's prerecorded messages and the awards seen in the case featured in the lobby suggest a time of pride and optimism for the company.
The complex for the Propulsion Gel spheres was completed in the early 1970s after Aperture suffered major financial and legal setbacks, as well as (according to Johnson) industry espionage by competitor Black Mesa. Offices are decorated in brown, yellow and orange paneling typical of 1970s America. Posters caution employees to notify their supervisors if they spot inspectors from any of a long list of government safety agencies. These tests were using hobos hired off the street and paid $60 per test.
The complex for the Conversion Gel spheres was completed in the early 1980s when Aperture had begun to replace its employees with robots, leaving the employees themselves to act as Test Subjects. Posters motivate human employees to accept their robotic replacements and give advice on how to deal with rogue artificial intelligences.
===Enrichment Spheres===
FileEnrichment Sphere 07 Test Shaft 09 Portal 2.jpg|200px|right|thumb|Enrichment Sphere 07, with Sphere 06 in the foreground.
Test Shaft 09 is mostly filled with 7 Enrichment Spheres - large geodesic asbestos and steel spheres located one above the other, and containing the original chambers used by Aperture Science Innovators for tests of its Mobility Gels in conjunction with ancestors of the modern Aperture Science Handheld Portal Device|Handheld Portal Device. Each sphere typically contain two Test Chambers supported by steel pylons and connected by catwalks. Spheres also contain offices and observation rooms around their periphery. Elevators provide transport between spheres.
Most of the testing spheres and the bottom of the shaft itself contain pools of highly corrosive toxic waste. The signs warning not to fall into the waste suggest it has been there from the start.
===Other Test Chambers===
Experiments that did not require the space or modularity of the portal/gel tests were located in side chambers accessed by heavy doors near the '50s and '70s-era reception areas. Almost all of these chambers have been vitrified. Cave Johnson's prerecorded messages near these doors describe absurd side effects mentioned above. Of particular interest is an unsealed door leading to the drydock of the missing ''Borealis''.
===Pumping Stations===
FilePortal2 2011-05-28 21-32-53-18.jpg|200px|left|thumb|Inside Pumping Station Beta.
The shaft also contains three Pumping Stations codenamed Alpha, Beta, and Gamma which pump the three Mobility Gels up the shaft and into various testing chambers (each bearing the color of its related gel), suggesting that a huge reserve of Mobility Gels must be located somewhere in the salt mine, as well as the main Pump Station located at the top of Test Shaft 09 and feeding the gel pipe network into the modern Enrichment Center. These stations were taken offline when the shaft was abandoned, but are reactivated by Chell during her journey, restoring the gel flow from the lowest levels to the modern facility. The stations are in surprisingly good repair given the amount of time passed since they were last maintained. The catwalks have decayed, but the pipe system has survived with only a few broken valves and leaking flanges.
==Layout==
===Introduction area===
====Tartaros====
FilePortal2 2011-05-29 14-09-56-04.jpg|thumb|200px|right|Falling inside the seemingly bottomless elevator shaft.
In the Central AI Chamber at the end of the ''Portal 2'' chapter ''The Escape'', Wheatley plugs GLaDOS' memory to a potato, and put her with Chell in the elevator connected to the chamber. As GLaDOS explains him who he really is and calls him a moron, he has a fit of rage, and smashes the elevator several times until it is set loose into the shaft. The next chapter, ''The Fall'', opens as Chell and the now potato-powered GLaDOS fall into the 4375 meter-deep elevator shaft, an employee access to Test Shaft 09. During the fall, GLaDOS (now nicknamed "PotatOS"''Portal 2'' commentary) tells Chell more about Wheatley's background and how him being in charge of the facility is a catastrophe. At the end of the fall, the lowest part of the shaft appears to be destroyed and does not reach the floor; Chell and PotatOS fall onto the ground, and Chell passes out. When she wakes up, she witnesses PotatOS being pecked by a crow who quickly takes her away (while it is the same model, it is unknown if it is the same bird that attacked Wheatley earlier), and the elevator dangling at the end of the destroyed shaft up above.
FileAperture mine.jpg|200px|left|thumb|Overview of the "Tartaros" area.
Chell then proceeds to an area that seems part ruined / part in construction, one of the two entrances to Test Shaft 09 to be used only by employees. Large pillars appear to support the modern facility above, and are marked with the number "09" and the name "Tartaros". In the Greek mythology, WikipediaTartarus|Tartarus is a large gloomy pit or abyss used as a dungeon of torment and suffering that resides beneath the underworld, and where several Titans were sent by Zeus for punishment; this is paralleled here, with Chell being sent in large gloomy abyss as a punishment from Wheatley. "09" is probably related to this particular area of the mines, since the Enrichment Shaft located nearby bears the same number. Also above these pillars there seem to be new GlaDOS style test chambers.
Aided by her ASHPD creating portals on the portalable surfaces, Chell proceeds through the area, which is still fully powered, with ongoing fires of carcasses of Aperture Science Sentry Turret|Sentry Turrets. Many red cranes can also be seen; many other pillars and cranes appear to extend very far under the facility, possibly in areas bearing other numbers. The whole area seems to be uncompleted, as many scaffolds are still in place.
FilePortal2 2011-06-17 17-24-55-42.jpg|200px|right|thumb|The barred way to the condemned testing area.
Chell then finds herself facing a wall barring the way to the "condemned testing area" of Test Shaft 09, condemned by vitrification on Timeline of the Half-Life universe 15|June 15, 1961, with three small shut doors. There two signs indicate the current status and condemnation date of the shaft mentioned above. Many "Keep out" and "Do not enter" signs are present. Conversion Gel pipes are also seen coming from above, disappearing farther into the rock. Thanks to her portal gun, Chell easily circumvents the wall, and proceeds through a narrow path along which a pipe runs, until she reaches the Abandonment Hatch.
====Abandonment Hatch====
The Abandonment Hatch is a gargantuan metal hatch that seals Test Shaft 09 from that part of the facility. There the condemnation date is seen again. To open the hatch, two persons have four seconds to press the two "Hatch Reclusion Override" buttons each found in the two cabins located on left and right of the hatch, each with a countdown outside of them. As Chell is alone, she uses her portals to push both buttons. When the hatch opens, it reveals it was hiding only a small human-size door (along with a chair and knocked down stool), the rest of the hatch space being a mere wall, a rather (purposely) anticlimactic result. Beyond the door is a small corridor leading to another small door, itself leading to the very bottom of the proper Test Shaft 09.
====Gallery====
{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Screenshots
|-
|
FilePotatos.jpg|PotatOS.
FileBirdbirdbird.jpg|The crow.
FilePortal2 2011-05-23 02-27-59-17.jpg|Chell holding her ASHPD during the fall, with PotatOS in the background.
FilePortal2 2011-05-29 14-08-34-75.jpg|The seemingly bottomless shaft.
FilePortal2 2011-05-29 14-10-11-07.jpg|The elevator falling above Chell and PotatOS.
FilePortal2 2011-05-23 02-27-27-18.jpg|PotatOS talking to Chell during the fall.
FilePortal2 2011-06-17 17-07-47-26.jpg|Passing by a sign showing a 3375 m-depth, with PotatOS falling.
FilePortal2 2011-05-23 02-31-21-64.jpg|The crow pecking the potato after the fall.
FilePortal2 2011-05-23 02-31-23-78.jpg|The crow flying off with PotatOS.
FilePortal2 2011-06-17 17-35-38-42.jpg|View from the spot where Chell woke up after the fall.
FilePortal2 2011-05-23 02-33-14-25.jpg|First view while exiting the "tower" where Chell woke up an another tower, with a buoy-like sign on it.
FilePortal2 2011-05-23 02-34-48-82.jpg|Chell using portalable surfaces to progress.
FilePortal2 2011-05-23 02-34-17-15.jpg|Turret fire.
FilePortal2 2011-05-29 23-57-10-43.jpg|Low-angle shot of the overall "Tartaros" area, with red cranes on the right, and the modern facility above.
FilePortal2 2011-04-25 22-36-45-93.jpg|Ditto, from slightly higher, with the area extending way beyond the cranes.
FileMenu act03.jpg|Burning Turrets in the related menu background video, not seen that way in-game.
FileAperture mine.jpg|Another view of the "Tartaros" area, with the access to Test Shaft 09 on the left.
FilePortal2 2011-05-30 00-00-25-79.jpg|Ditto, from nearer the Test Shaft 09, with "Tartaros 09" above.
FileLoadingscreen a3 1 widescreen.png|Test Shaft 09 loading screen, part 1.
FileLoadingscreen a3 2 widescreen.png|Ditto, part 2.
FileLoadingscreen a3 3 widescreen.png|Ditto, part 3.
FileLoadingscreen a3 4 widescreen.png|Ditto, part 4.
FilePortal2 2011-04-25 22-37-32-67.jpg|The wall before the condemned testing area of Test Shaft 09.
FilePortal2 2011-05-23 02-38-20-42.jpg|A glimpse of what lies beyond the wall, with "vitrification" and "cosmic ray spallation elements" notices.
FilePortal2 2011-05-23 02-40-35-71.jpg|"Tartaros 09" seen again, during Chell's journey through her portals and catwalks to go past the wall.
FilePortal2 2011-04-25 22-37-45-43.jpg|Beyond the wall.
FilePortal2 2011-04-25 22-38-00-75.jpg|Following the path to the Abandonment Hatch.
FilePortal2 2011-05-23 02-41-00-59.jpg|Ditto.
FilePortal2 2011-05-23 02-41-24-64.jpg|Ditto.
FilePortal2 2011-05-23 02-42-12-37.jpg|Test Shaft 09's name, sealing date and cabin 01, left of the hatch.
FilePortal2 2011-05-30 15-50-42-95.jpg|The countdown outside cabin 02, right of the hatch.
FilePortal2 2011-05-27 22-10-32-31.jpg|"''Danger In the event of flooding, seek air pockets''" notice inside cabin 02.
FilePortal2 2011-06-17 17-11-11-17.jpg|The hatch opening, as seen from cabin 01.
FilePortal2 2011-04-25 22-40-54-81.jpg|The hatch opening.
FilePortal2 2011-04-25 22-40-54-82.jpg|The hatch open, showing an anticlimactic wall and a small human-size door.
FilePortal2 2011-05-23 02-44-11-15.jpg|Reaching the door.
FilePortal2 2011-05-23 02-44-30-48.jpg|The corridor beyond the door, leading to Test Shaft 09's bottom.
|-
|}
{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Logos, signs and posters
|-
|
FileLoadingscreen default c 4 widescreen.png|The Aperture Science Innovators logo as used in the loading screen.
FileUnderground symbol 01.png|The buoy-like logo seen at the start of the level.
FileTartaros.png|The "Tartaros 09" stencil.
FileGel flow white.png|The first seen "Gel Flow" direction, used for the Conversion Gel.
FileUnderground keepout01.png|The large "Keep out" sign located before and after the condemnation wall.
FileUnderground nonotenter01.png|The large "Do not enter" sign located before and after the condemnation wall.
FileUnderground condemed testarea.png|The "condemned testing area" stenciled on the condemnation wall.
FileUnderground condemned01.png|The vitrification order, dated June 15, 1961 ''"Condemned / Vitrification Order / 06/15/1961 / Do not look at, touch, ingest or engage conversation with any substances located beyond this point."''
FileUnderground warning01.png|"''Warning This Enrichment Shaft may contain unsafe quantities of cosmic ray spallation elements''".
FileUnderground keepout.png|Small "Keep out" sign seen on the condemnation wall.
FileDecalsigndanger001e.png|Common danger sign seen on a door on the condemnation wall, seen in other Valve games ''Danger / Admittance to authorized personnel only''.
FileTest shaft 09 signage.png|Test Shaft 09's name and condemnation date stencil as seen left of the Abandonment Hatch, on its original concrete texture.
FileUnderground seal procedure.png|"''In the event of flooding, seek air pockets''" sign seen in cabin 02 right of the Abandonment Hatch.
FileUnderground airpockets01.png|Another "''Danger In the event of flooding, seek air pockets''" sign, cut from the final game.
FileConsole sign override1.png|"Hatch Reclusion Override" notice as seen on the consoles in cabins 01 and 02.
|-
|}
===1950s levels Repulsion Gel===
FilePortal2 2011-05-23 02-45-12-46.jpg|200px|right|thumb|Chell's first view of Test Shaft 09, at its very bottom.
The Mobility Gel tested in this level era is the Repulsion Gel.
====1952 Entrance Way, Lobby and Testing Lounge====
The proper way to reach that part (i.e. the Test Subject way) is by arriving from the Main Lift from the surface. It will lead to the reception area (Sublevel 193), which is made of the Entrance Way, the Lobby and the Testing Lounge.
Chell however arrives directly into the shaft itself from the Abandonment Hatch (which is restricted to employees), where she can see the first two Enrichment Spheres, a sign warning not to fall into a lake of toxic waste filled with six small spheres and a destroyed "Aperture Science Innovators" metal logo that fell from above, and the building date, 1952, on a wall. While Chell proceeds, cables and debris detach from Sphere 01. A catwalk then leads to another level, where three doors leading to contaminated and vitrified areas are found. The first one, breached by the collapsed ceiling, is an employee door leading to the Test Subject reception area, with breaker 135B that provides power to the latter (it bears the alphanumeric "B-09/S", used many times in the level). The second door leads to Test Chambers 1 to 200. It has a notice stating the experiment was discontinued, with the image of an Enrichment Sphere filled with cement, suggesting other spheres (maybe smaller like the ones in the water) could be located there, and that Aperture must have been running an incredible amount of other unknown experiments. The third door shows the existence of 8 other Enrichment Shaft|Test Shafts, as it leads to an underground train network linking them together. Near the door is also a notice with an Enrichment Sphere filled with cement, placed there for unknown reasons.
=====Entrance Way=====
FilePortal2 2011-05-30 22-20-57-39.jpg|200px|left|thumb|What Test Subjects would see when arriving.
Back to the reception area, the Main Lift shaft is empty and condemned, and the elevator, located several hundreds of meters above, is out of order until a undetermined date. Back then in the 1950s, Test Subjects leaving the Main Lift would reach the Entrance Way and meet a sign with on it "Aperture Science Innovators" (Aperture's trademark, created in 1947, later renamed "Aperture Laboratories") and "Welcome to the future of tomorrow!" above, with a mountain skyline as a background, as well as a faded blue metal Aperture Science Innovators logo, the same as the one that fell into the shaft's bottom. A catwalk through the Entrance Way, carved into the rock, would lead to the Lobby and Testing Lounge. Aperture Science|Aperture CEO Cave Johnson would greet Test Subjects with great enthusiasm, joined with his assistant Caroline, in the following prerecorded announcement, accompanied with an early rendition of the music heard in the http//www.youtube.com/user/CombineOverWiki/882F1C10DB52A986 Aperture Investment Opportunity videos and the television in Chell's chamber in the Extended Relaxation Center
{{Quotation|- Cave ''Welcome, gentlemen, to Aperture Science. Astronauts, war heroes, Olympians - you're here because we want the best, and you are it. So Who is ready to make some science?''
- Caroline ''I am!''
- Cave ''Ha ha! Now, you already met one another on the limo ride over, so let me introduce myself I'm Cave Johnson. I own the place. That eager voice you heard is the lovely Caroline, my assistant. Rest assured, she has transferred your honorarium to the charitable organization of your choice. Isn't that right, Caroline?''
- Caroline ''Yes sir, Mr. Johnson!''
- Cave ''She's the backbone of this facility. Pretty as a postcard, too. Sorry, fellas. She's married. To science.''}}
Cave sounds very enthusiastic and eager, and has Caroline at his side. Back then, Aperture was using high profile and trained Test Subjects such as WikipediaAstronaut|astronauts, war heroes, and WikipediaOlympic Games|Olympians, driven to the facility in a limousine, and whose honorariums was transferred to the charitable organization of their choice.
When Chell visits the place, the catwalk leading to the Lobby has been destroyed, and she must portal herself through the gap by using momentum and going through the Aperture Science Innovators sign, after the nuclear logo in its center falls on the ground after detaching itself.
=====Lobby=====
FilePortal2 2011-05-27 22-20-23-29.jpg|200px|right|thumb|First view of the Lobby.
Upon reaching the lobby, Test Subjects would be greeted by this message
{{Quotation|''There's a thousand tests performed every day here in our Enrichment Spheres. I can't personally oversee every one of them, so these prerecorded messages'll cover any questions you might have, and respond to any incidents that may occur in the course of your science adventure. Your test assignment will vary, depending on the manner in which you have bent the world to your will.''
''Those of you helping us test the Repulsion Gel today, just follow the blue line on the floor. Those of you who volunteered to be injected with praying mantis DNA, I've got some good news and some bad news. Bad news is we're postponing those tests indefinitely. Good news is we've got a much better test for you fighting an army of Mantis Men. Pick up a rifle and follow the yellow line. You'll know when the test starts.''}}
The message suggests a very brisk and busy era for Aperture, with a thousand tests performed every day in the Enrichment Spheres. Test Subjects would test the newly created Repulsion Gel, but also be injected mantis DNA, turning them into Mantis Men (postponed for some reason), which would also be fought by other Test Subjects as part of another test. The message asks Test Subjects sent to fighting Mantis Men to pick up a rifle and follow a yellow line, but it cannot be found anywhere, the only path being to Enrichment Sphere 01 or three unrelated Test Chambers.
The Lobby is a room with black marble and a maroon carpet on the floor, and wooden panes on the walls. Four lamps with spherical lampshades hang from the ceiling. A sign asks Test Subjects to go to the small desk nearby and sign in with the receptionist before proceeding to the Lounge. Next to the Lobby is an elongated operator room filled with several desks equipped with typewriters and phones, probably used for registering candidates.
=====Testing Lounge=====
FilePortal2 2011-04-25 22-57-44-06.jpg|200px|left|thumb|The Testing Lounge, featuring a portrait of Cave Johnson and a case full of awards.
The Testing Lounge is accessed through a folded red curtain. Its floor is fully covered with maroon carpet, and it is filled with large conformable beige armchairs, as well as several ashtrays. It also has six spherical lamps on the ceiling. Of note is the large portrait of a young and brisk Cave Johnson placed between two cases. One of the cases has been broken and emptied; the other is filled with many items giving information about Aperture's background and evolution four trophies, including the Spirit of Idaho 1955 award for the promotion of Potato Science, by the National Potato Board; the Shower Curtain Salesman of 1943 award for Aperture Fixtures; and two "Contractor of the Year - Runner Up" awards from the WikipediaUnited States Department of Defense|US Department of Defense, dated 1952 and 1954 (an unseen 1953 award can also be found in the game files). The case also includes the main page of the newspaper ''The Up Pioneer Press'', dated from a Thursday of Timeline of the Half-Life universe 1944, showing that Johnson purchased salt mines in Upper Michigan, where and above which the Aperture Science Enrichment Center will eventually be built, retconning the facility's location from Cleveland to Michigan.FileBorealis plans 01.png|''Borealis'' blueprint Under a picture of the mine, Johnson is quoted "''The Future is Here, and it's Under the Earth's Crust''". Finally, four framed awards can be seen the Best New Science Company award 1947 given to Aperture Science by the Science and Business Institute of America; another Spirit of Idaho award by the National Potato Board Award for the promotion of Potato Science, undated; the Shower Curtain Salesman of 1943 award given to Cave Johnson for Aperture Fixtures; and finally an award for rank #2 for Aperture Science in the Top 100 Applied Science Companies 1949.
FilePortal2 2011-05-27 21-41-35-29.jpg|200px|right|thumb|View of the bottom of the shaft, with the attendant-operated elevator tower on the right, surrounded with metal stairs.
After leaving the Testing Lounge to the shaft proper, Test Subjects would go to an elevator operated by an attendant. Upstairs, a catwalk, now collapsed, would lead either to the small elevator going inside Enrichment Sphere 01, Pump Station Alpha, or three condemned Test Chambers, two vitrified (one of which filled with cement), the other apparently not condemned, but inaccessible regardless. Near each door leading to these chambers is an interphone, which when powered will give the following prerecorded messages by Johnson about what tests they involve
{{Quotation|''- If you've cut yourself at all in the course of these tests, you might have noticed that your blood is pure gasoline. That's normal. We've been shooting you with an invisible laser that's supposed to turn blood into gasoline, so all that means is, it's working.''
''- If you need to go to the bathroom after this next series of tests, please let a test associate know, because in all likelihood, whatever comes out of you is going to be coal. Only temporary, so do not worry. If it persists for a week, though, start worrying and come see us, because that's not supposed to happen.''
''- Just a heads up We're gonna have a superconductor turned up full blast and pointed at you for the duration of this next test. I'll be honest, we're throwing science at the wall here to see what sticks. No idea what it'll do. Probably nothing. Best-case scenario, you might get some superpowers. Worst case, some tumors, which we'll cut out.''}}
These tests suggest strong recklessness from Aperture, suggesting the team doesn't really know what they are doing.
====Pump Station Alpha====
FilePortal2 2011-05-27 22-35-21-95.jpg|200px|left|thumb|Pump Station Alpha's console.
The first of the three Mobility Gel Pump Stations found in Test Shaft 09, probably also built in 1952, is used to pump Repulsion Gel. It is actioned from a switch on a console in a booth located at the lowest level, with a screen showing the six spheres used in Test Shaft 09. The booth contains three motivational posters "''Know your... Allergens''" ("''pollen''", "''animal dander''", "''plastics''", "''anti-matter''"), "''Know your... Hazardous Materials''" (''"Don't touch anything unfamiliar"''), and "''Know your... Chemical Hazards''" ("''Do not inhale fumes - no matter how good they smell''"). Above on a catwalk leading back to the shaft can be found a safety poster saying "''Together we can make 1956 the lowest unexpected casualty annum ever!''".
After powering back Pump Station Alpha, Chell portals herself near the small elevator leading to Enrichment Sphere 01 to begin her introduction to Aperture's Mobility Gels. At the entrance of the elevator is introduced an early iteration of the Aperture Science Material Emancipation Grill|Material Emancipation Grill, the first of several early iterations of familiar Aperture technology that can be found in the shaft.
Before entering the elevator, Test Subjects would hear the following overenthusiastic message
{{Quotation|''They say great science is built on the shoulders of giants. Not here. At Aperture, we do all our science from scratch. No hand holding.''}}
This references the metaphor "WikipediaStanding on the shoulders of giants|Standing on the shoulders of giants", meaning "One who develops future intellectual pursuits by understanding the research and works created by notable thinkers of the past".
====1953 Enrichment Sphere 01====
FilePortal2 2011-05-27 22-55-46-93.jpg|200px|right|thumb|Overall view of inside Enrichment Sphere 01.
The elevator leads to a dark Sphere 01. When it stops, the sphere is lit up, revealing a "You are here" sign showing a partial plan of the Enrichment Shaft complex, although it incorrectly shows Test Shaft 09 with 9 spheres instead of 7. Test Subjects were welcomed by that Cave Johnson announcement
{{Quotation|''Alright, let's get started. This first test involves something the lab boys call "Repulsion Gel."'' ''You're not part of the control group, by the way. You get the gel. Last poor son of a gun got blue paint. Hahaha. All joking aside, that did happen - broke every bone in his legs. Tragic. But informative. Or so I'm told.''}}
Again, Cave is rather reckless and nonchalant about something grave happening, typical of the cynical writing style of the ''Portal'' story arc. Furthermore, The "paint" may be a reference to the concept behind the Mobility Gels, i.e. the paint from ''Tag The Power of Paint''. In ''Tag'', the blue paint allows its user to walk on walls and ceilings covered by it (which originally also Sticking Gel|was to be featured in ''Portal 2'').
=====Test Chamber 01=====
FilePortal2 2011-05-27 22-59-07-23.jpg|200px|left|thumb|Upon entering Test Chamber 01, a Repulsion Gel fact placard can be read.
Outside this first Test Chamber can be found a building date, 1953, and a sign stating that "''This test is unsolvable without an Aperture Science Portable Quantum Tunneling Device. If you have not received one, please find a test associate before participating in any Shaft 09 Enrichment Activities''", with in the center the picture of a Test Subject bearing a huge Handheld Portal Device prototype.
Inside the Test Chamber are introduced early iterations of familiar Aperture technologies, paired with the use of the Repulsion Gel an early Aperture Science Weighted Storage Cube|Weighted Storage Cube used with an early 1500 Megawatt Aperture Science Heavy Duty Super-Colliding Super Button|1500 Megawatt Heavy Duty Super-Colliding Super Button and an early Aperture Science Switch|Switch, used to release the Cube through an early Aperture Science Vital Apparatus Vent|Vital Apparatus Vent. A short story about the Repulsion Gel is also found on a sign at the entrance of the Test Chamber, near the early iteration of the squared testing element sign, named "Aperture Science Fact Placard - Repulsion Gel" ''"Did you know Repulsion Gel was Aperture's first attempt to create a dietetic pudding substitute?"'', followed by Repulsion Gel in a spoon, then "''It's true. The gel is a sweeter, slightly less non-toxic form of fiberglass insulation that causes subsequently-ingested food items to bounce off the lining of a dieter's distended stomach and out his or her mouth! (For various reasons, this product was pulled from shelves.)"'', the under it, in small letters ''"For more information, consult the following Fact Placards Aperture Science Fact Placard - 'Repulsion Gel, Lawsuits Concerning' / Aperture Science Fact Placard - 'Repulsion Gel, Public Outrage Over'"'' After the test has been performed, the following message is played
{{Quotation|''The lab boys just informed me that I should not have mentioned the control group. They're telling me I oughtta stop making these prerecorded messages. That gave me an idea make more prerecorded messages. I pay the bills here, I can talk about the control group all damn day.''}}
Johnson does not like having people telling him what to do, also referenced for instance in the memos revealed during the Portal ARG|''Portal'' ARG, in which Cave complains about the "bean counters".
=====Test Chamber 02=====
FilePortal2 2011-05-27 23-12-41-51.jpg|200px|right|thumb|The Repulsion Gel-covered walls in Test Chamber 02.
The next Test Chamber was originally to be reached through several catwalks, but since they have collapsed, Chell must use her Portal Gun instead to reach the other side. Its construction appears to have started in 1953 and ended in 1956. Before entering, the following message is played
{{Quotation|''For this next test, we put nanoparticles in the gel. In layman's terms, that's a billion little gizmos that are gonna travel into your bloodstream and pump experimental genes and WikipediaRNA|RNA molecules and so forth into your tumors.''
''Now, maybe you don't have any tumors. Well, don't worry. If you sat on a folding chair in the lobby and weren't wearing lead underpants, we took care of that too.''}}
In this Test Chamber, the Repulsion Gel is said to have been injected with an additive said to cure tumors. It is unknown what "lobby" Cave is referring to, but the Lobby found at the bottom of the Shaft has no folding chairs. The "lead underpants" would also suggest this lobby (or at least its folding chairs) is irradiated.
A more elaborate test is proposed, with an early Unstationary Scaffold used to take hold of a Cube, as well as two walls covered in Repulsion Gel, having Test Subjects to bounce from one to the other to reach another Cube. These two Cubes are to be used on a Super Button, triggering portalable panels, allowing Test Subjects to exit. Outside, the following message is played
{{Quotation|''Oh, in case you got covered in that Repulsion Gel, here's some advice the lab boys gave me DO NOT get covered in the Repulsion Gel.''
''We haven't entirely nailed down what element it is yet, but I'll tell you this it's a lively one, and it does NOT like the human skeleton.''}}
It is easy to have Chell covered with the Repulsion Gel, although it has no effect on her health an any point of the game; it is possible these effects have waned over the decades. Then an elevator leads to Sphere 02.
====1957 Enrichment Sphere 02====
FilePortal2 2011-05-27 23-17-59-53.jpg|200px|left|thumb|The destroyed Test Chamber 01.
In this sphere built in 1957 Test Subjects were introduced by the following message, revealing that the spheres are made of asbestos to keep out the rats
{{Quotation|''All these science spheres are made of asbestos, by the way. Keeps out the rats. Let us know if you feel a shortness of breath, a persistent dry cough or your heart stopping. Because that's not part of the test. That's asbestos.''
''Good news is, the lab boys say the symptoms of asbestos poisoning show a median latency of 44.6 years, so if you're thirty or older, you're laughing. Worst case scenario, you miss out on a few rounds of Canasta, plus you forwarded the cause of science by three centuries. I punch those numbers into my calculator, it makes a happy face.''}}
Again, Chell does not seem to have any of these symptoms anywhere later in the game.
=====Test Chamber 01=====
Test Chamber 01 cannot be used as it collapsed on the wall, forcing Chell to reach the bottom of the Sphere then reach the second Test Chamber with portals.
=====Test Chamber 02=====
FilePortal2 2011-05-27 23-25-31-56.jpg|200px|right|thumb|After throwing Repulsion Gel in the needed spots in Test Chamber 02.
FileRepulsion gel portal.jpg|200px|right|thumb|Screenshot of the "Repulsion Gel" video shown at E3 2010, showing the same Test Chamber with a modern design.
Outside this chamber can be seen the date 1957, though it cannot be seen from the start elevator, but can at the end one.
Despite the original entrance of the chamber being condemned, Chell starts testing in the proper place, and is met with the following message
{{Quotation|''Ha! I like your style. You make up your own rules, just like me.''
''Bean counters said I couldn't fire a man just for being in a wheelchair. Did it anyway. Ramps are expensive.''}}
The message suggests the proper entrance has always been condemned, since Johnson shows appreciation in the way the Test Subject reaches the Test Chamber through another way. Here Cave also shows his complete disregard for rules and lack of empathy, firing someone in a wheelchair, just because wheelchair ramps are expensive.
This Test Chamber involves using a Repulsion Gel dispenser to portal the gel in the needed places, then make a long jump to the exit. As the first Test Chamber is destroyed, the test is already over after that, and Chell proceeds to Sphere 03, before hearing the following
{{Quotation|''Just a heads-up That coffee we gave you earlier had fluorescent calcium in it so we can track the neuronal activity in your brain. There's a slight chance the calcium could harden and vitrify your frontal lobe. Anyway, don't stress yourself thinking about it. I'm serious. Visualizing the scenario while under stress actually triggers the reaction.''}}
This Test Chamber was originally built with a modern design, as seen in the http//www.youtube.com/watch?v=vZxXth2HaVw&hd=1 Repulsion Gel video shown at E3 2010.
====1958 Enrichment Sphere 03====
FilePortal2 2011-05-28 21-13-09-35.jpg|200px|left|thumb|View of Test Chambers 27 and 28.
This Sphere starts with the following message
{{Quotation|''Now, if you're part of Control Group Kepler-Seven, we implanted a tiny microchip about the size of a postcard into your skull. Most likely you've forgotten it's even there, but if it starts vibrating and beeping during this next test, let us know, because that means it's about to hit five hundred degrees, so we're gonna need to go ahead and get that out of you pretty fast.''}}
It seems that the control groups have nicknames, in this case "Kepler-Seven". Of note is that Enrichment Sphere 06 was originally named "Hotel Kepler". Furthermore, the microchip Test Subjects would be implanted into seems highly unstable.
=====Test Chamber 27=====
FileChamber 27 Test Shaft 09 Portal 2.jpg|200px|right|thumb|Water flowing in Test Chamber 27.
Outside the first Test Chamber (numbered "27" for some reason) can be seen the building date 1958. Inside, the test involves precise timing, as water brought through a Conversion Gel pipe makes the Repulsion Gel go away, preventing the Test Subject to jump on it.
In the next room, the following message is heard
{{Quotation|''I'm telling 'em, keep your pants on.''
''Alright, this next test may involve trace amounts of time travel. So, word of advice If you meet yourself on the testing track, don't make eye contact. Lab boys tell me that'll wipe out time. Entirely. Forward and backward! So do both of yourselves a favor and just let that handsome devil go about his business.''}}
On the wall can also be seen a sign with the following words ''"Remember! If a future you tries to warn you about this test, don't listen."''
The next area is set above Test Chamber 27, and the Repulsion Gel dispenser must be used to reach the next chamber. Nearby is a safety sign reminding that accidents hurt "you" ("''you will be hurt''"), "coworkers" ("''don't endanger others''"), "the company" ("''replacements are costly''"), and "science" ("''investigations impede progress''").
Cave's warning and the sign on the wall suggest Aperture had mastered time travel in the 1950s. However no apparent "trace amount of time travel" is seen at any time, possibly because the test chamber supposed to feature it is inaccessible.
=====Test Chamber 28=====
FilePortal2 2011-05-28 21-16-53-78.jpg|200px|left|thumb|The Repulsion Gel-covered Weighted Antique Cube bouncing around Test Chamber 28.
When reaching the catwalks below Test Chamber 28, the following message is heard
{{Quotation|''If you're hearing this, it means you're taking a long time on the catwalks between tests. The lab boys say that might be a fear reaction.''
''I'm no psychiatrist, but coming from a bunch of eggheads who wouldn't recognize the thrill of danger if it walked up and snapped their little pink bras, that sounds like 'projection'.''
''THEY didn't fly into space, storm a beach, or bring back the gold. No sir, we did! It's you and me against the world, son! I like your grit! Hustle could use some work, though. Now let's solve this thing!''}}
Cave likes Test Subjects whoever they are, and publicly discredits his colleagues.
Test Chamber 28 was also built in 1958. Inside can be found an early Weighted Storage Cube in a large glass case, which must be broken after the Cube is covered in Repulsion Gel and starts bouncing around the chamber. After being released, it must be caught and washed to be used on a button that will trigger the exit platform, then covered in gel again to release the platform. There is an achievement called "Schrodinger's Catch" associated with catching the box before it touches the ground in this test.
Before the exit elevator, the following message, in which Johnson gets angry, is heard
{{Quotation|''Science isn't about WHY. It's about WHY NOT. Why is so much of our science dangerous? Why not marry safe science if you love it so much. In fact, why not invent a special safety door that won't hit you on the butt on the way out, because you are fired.''
''Not you, Test Subject, you're doing fine.''
''Yes, you. Box. Your stuff. Out the front door. Parking lot. Car. Goodbye.''}}
Despite being a prerecorded message, Cave seems genuinely mad. Of note is that the lines until "because you are fired" were reused from File08041249.801.png|a memo revealed during the Portal ARG|''Portal'' ARG, in a completely different context.
If the players catches the gel covered cube in the air from the glass case before it hit the ground, "Schrodinger's Catch" Portal 2 Achievements and Trophies|achievement/trophy will be unlocked.
====Elevator access====
FilePortal2 2011-05-28 21-23-58-95.jpg|200px|right|thumb|View from above Enrichment Spheres 03 and 02.
Right after leaving the Sphere elevator, the following message is heard, concluding the test series performed in the 1950s
{{Quotation|- Cave ''Congratulations! The simple fact that you're standing here listening to me means you've made a glorious contribution to science.''
''As founder and CEO of Aperture Science, I thank you for your participation and hope we can count on you for another round of tests.''
''We're not gonna release this stuff into the wild until it's good and damn ready, so as long as you keep yourself in top physical form, there'll always be a limo waiting for you.''
''Say goodbye, Caroline.''
- Caroline ''Goodbye, Caroline.''
- Cave ''She is a gem.''
}}
This closes the 1950s area on the same enthusiast and optimistic tone in which it started.
FilePortal2 2011-05-28 21-21-03-90.jpg|200px|left|thumb|The lounge at the 1950s elevator access.
Four Spheres can be seen from here the two last from the 1950s below, and the two from the 1970s above.
The access to the Main Lift follows, with a small lounge in the same style as that of the Testing Lounge featured at the bottom of the shaft, with another portrait of a brisk Cave Johnson, as well as a sign thanking Test Subjects for their participation. Inside the elevator shaft can be seen that the area is at a 4000 m depth.
====Gallery====
{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Screenshots
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FilePortal2 2011-05-27 21-31-17-21.jpg|View of the platforms at Test Shaft 09's bottom, as first seen by Chell.
FilePortal2 2011-05-27 21-27-03-23.jpg|Ditto, from farther.
FilePortal2 2011-05-27 21-26-17-59.jpg|The smaller spheres lying in the toxic waste.
FilePortal2 2011-05-27 21-27-31-40.jpg|Ditto, from behind, partially under the rock.
FilePortal2 2011-05-27 21-27-53-67.jpg|The fallen Aperture Science Innovators logo.
FilePortal2 2011-05-27 21-42-10-21.jpg|Enrichment Sphere 01 from below, with a glimpsed of Sphere 02 above.
FilePortal2 2011-05-27 21-28-16-82.jpg|The breached door to the Entrance Way.
FilePortal2 2011-05-27 21-29-02-37.jpg|The sealed door to the underground train linking the 9 Test Shafts together.
FilePortal2 2011-05-27 21-28-36-71.jpg|The sealed door to Test Chambers 1 to 200.
FilePortal2 2011-05-27 21-47-56-04.jpg|Breaker 135B before the Entrance Way.
FileAperture old logo back.jpg|First view of the Entrance Way, after the nuclear logo has detached itself for the Aperture Science Innovators logo.
FilePortal2 2011-05-27 22-17-55-26.jpg|The logo as seen from the Main Lift side.
FilePortal2 2011-05-27 22-16-42-92.jpg|Entrance to a long tunnel located right of the Main Lift.
FilePortal2 2011-05-27 22-23-02-93.jpg|Access to the Main Lift.
FilePortal2 2011-05-30 22-22-37-04.jpg|Welcome sign and Aperture Science Innovators logo, and the Test Subject catwalk.
FilePortal2 2011-05-27 22-19-09-37.jpg|Chell teleporting herself through the Aperture logo to reach the collapsed catwalk.
FilePortal2 2011-04-25 22-56-56-92.jpg|The other end of the Lobby, with a sign welcoming Test Subjects and the info desk, and a glimpse of the Testing Lounge beyond the curtain.
FilePortal2 2011-05-27 22-21-30-68.jpg|The operator room next to the Lobby.
FilePortal2 2011-04-25 22-57-59-92.jpg|Cave Johnson's first portrait and award case in the Testing Lounge.
FilePortal2 2011-05-27 22-26-56-56.jpg|The Testing Lounge as seen from the Shaft.
FilePortal2 2011-05-27 22-27-46-65.jpg|The way leading to the attendant-operated elevator.
FilePortal2 2011-05-27 21-25-47-31.jpg|The platforms and the Testing Lounge as seen from the foot of the elevator tower.
FilePortal2 2011-05-27 22-29-19-68.jpg|In the elevator.
FilePortal2 2011-05-27 22-31-26-56.jpg|Looking up the shaft while ascending.
FilePortal2 2011-05-27 22-31-47-09.jpg|Sign at the end of the elevator rise, advising not to do what Chell is exactly about to do.
FilePortal2 2011-05-27 22-32-55-18.jpg|Conveniently placed portal at the bottom of the elevator shaft.
FilePortal2 2011-05-27 22-45-54-79.jpg|View of the bottom of Test Shaft 09, with the elevator shaft on the right, surrounded with metal stairs.
FilePortal2 2011-05-27 22-47-11-78.jpg|The doors to the three condemned Test Chambers near the top of the elevator.
FileRepulsion Gel Tanks Test Shaft 9 Portal2 .jpg|The Repulsion Gel tanks.
FilePortal2 2011-05-27 22-45-13-57.jpg|The door to Pump Station Alpha.
FilePortal2 2011-05-27 22-37-01-62.jpg|Inside Pump Station Alpha.
FilePortal2 2011-05-27 22-34-29-87.jpg|In Pump Station Alpha's control room.
FilePortal2 2011-05-27 22-37-42-73.jpg|Leaving Pump Station Alpha.
FilePortal2 2011-05-27 22-45-27-10.jpg|The elevator to Enrichment Sphere 01, preceded by an early Material Emancipation Grill.
FilePortal2 2011-05-27 22-51-40-35.jpg|"You are here" sign at the start of Sphere 01.
FilePortal2 2011-05-27 22-55-11-39.jpg|Overall view of Sphere 01.
FilePortal2 2011-05-27 22-58-24-07.jpg|The entrance to Test Chamber 01.
FilePortal2 2011-05-27 23-04-06-37.jpg|Early Switch in Test Chamber 01.
FilePortal2 2011-05-27 23-03-08-43.jpg|Early Cube on early Supper Button in Test Chamber 01.
FilePortal2 2011-05-27 23-04-21-76.jpg|Early Material Emancipation Grill in Test Chamber 01.
FilePortal2 2011-05-27 23-04-39-07.jpg|Outside Test Chamber 02.
FilePortal2 2011-05-27 23-05-46-48.jpg|Office near Test Chamber 02.
FilePortal2 2011-05-27 23-06-55-50.jpg|The entrance to Test Chamber 02.
FilePortal2 2011-05-27 23-09-06-70.jpg|Inside Test Chamber 02.
FileOld Unstationary Scaffold.jpg|Early Unstationary Scaffold in Test Chamber 02.
FilePortal2 2011-05-27 23-11-41-76.jpg|Early Material Emancipation Grill in Test Chamber 02.
FilePortal2 2011-05-27 23-12-02-39.jpg|Early Cube Supper Button in Test Chamber 02.
FileOld Vital Apparatus Vent.jpg|Early Vital Apparatus Vent in Test Chamber 02.
FilePortal2 2011-05-27 23-15-31-37.jpg|Material Emancipation Grill-equipped Test Chamber 02's exit.
FileSphere 02 outside noclip.jpg|Noclip view of Enrichment Sphere 02, showing the map is the sphere itself.
FilePortal2 2011-05-27 23-19-42-04.jpg|At the bottom of Enrichment Sphere 02.
FilePortal2 2011-05-27 23-23-16-18.jpg|Repulsion Gel dripping from a vent in Sphere 02's Test Chamber 01.
FilePortal2 2011-06-17 20-19-54-57.jpg|Detail of the vent.
FilePortal2 2011-05-27 23-23-57-90.jpg|Repulsion Gel being conveniently placed with the use of portals.
FilePortal2 2011-05-27 23-26-37-90.jpg|Looking back at the path flown in Test Chamber 01.
FilePortal2 2011-05-28 20-59-47-43.jpg|"Future you" sign outside Test Chamber 27 in Enrichment Sphere 03. FileUnderground paradoxes01.png|TwoFileUnderground futureyou2.png|other version cut from the final game exist.
FilePortal2 2011-05-28 21-02-13-48.jpg|"Accidents hurt" sign above Test Chamber 27.
FilePortal2 2011-05-28 21-06-42-26.jpg|Before freeing the Cube in Test Chamber 28.
FilePortal2 2011-05-28 21-08-23-40.jpg|The elevator exiting the 1950s spheres.
FilePortal2 2011-05-28 21-21-22-79.jpg|The lounge at the Main Lift access.
|-
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{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Logos, signs and posters
|-
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FileUnderground sphere 001.png|Cut Sphere 01 sign "Whiskey-Hubble".
FileUnderground sphere 002.png|Cut Sphere 02 sign "Bravo Volta".
FileUnderground sphere 003.png|Cut Sphere 03 sign "Oscar Darwin".
FileUnderground caution railing.png|"Caution Do no lean on railing" sign set near the toxic water.
FilePaint caution sign.png|Another warning sign set near the toxic water, showing a human being eaten away by the waste.
FileVitrified.png|"Vitrified" stenciled on several doors.
FilePressure door sign.png|"Keep out - contamination area" sign.
FileUnderground vitrified01.png|"Notice - experiment discontinued" sign, featuring an Enrichment Sphere being filled with cement.
FileAperture metal logo 40s damaged.jpg|Damaged Aperture Science Innovators sign.
FileGel flow blue.png|Repulsion Gel "Gel Flow" direction.
FileGel tank NFPA 704.png|Modified "WikipediaNFPA 704|fire diamond" sign seen on Mobility Gel tanks outside the Pumping Stations, stating the tank contents are safe.
FileUnderground breaker1.png|Breaker 135B sign, indication the names of the following areas.
FileUnderground 50swelcome.png|"''Welcome to the FUTURE of TOMORROW!''" sign featured at the first Main Lift access, also showing the Aperture Science Innovators having been established in 1947.
FileMainlift sublevel.png|"Main Lift - Sublevel 193" sign.
FileOut of service.png|''Please excuse the inconvenience.'' / ''This elevator is out of order until'' notice seen on the Main Lift door.
FileAperture metal logo 40s full.jpg|Aperture Science Innovators metal sign featured in the Entrance Way.
FileScience innovators horiz metalblue.svg|Ditto, vector version.
FileUnderground 50s welcome.png|''Welcome Test Subjects!'' /'' Please sign in with the receptionist before proceeding to the lounge.'' sign featured in the Lobby.
FileCave johnson 50s.png|Portrait of Cave Johnson in the 1950s, featured in the Testing Lounge.
FileUnderground trophycase bestnewscience.png|"Best New Science Company" award.
FileUnderground trophycase potatoaward.png|"Spirit of Idaho" award.
FileUnderground trophycase newspaper.png|Front page of ''The Up Pioneer Press''.
FileUnderground trophycase showercurtain.png|"Shower Curtain Salesman of 1943" award.
FileUnderground trophycase top100.png|"Top 100 Applied Science Companies" award for Aperture Fixtures.
FileAperture fixtures.svg|The Aperture Fixtures logo.
FileUnderground attendant.png|"''Please... Wait for attendant to being lift. Thank you!''" sign featured at the bottom of the elevator shaft.
FileUnderground liftshaft 01.png|"''Caution Do not fall down elevator shaft''" sign featured at the top of the elevator shaft.
FileUnderground pumpstation alpha01.png|"Pump Station Alpha" stencil.
FileUnderground knowyour allergens.png|"''Know your... Allergens''" poster found in Pump Station Alpha.
FileUnderground knowyour hazardmaterials.png|"''Know your... Hazardous Materials''" poster found in Pump Station Alpha.
FileUnderground knowyour chemicals.png|"''Know your... Chemical Hazards''" poster found in Pump Station Alpha.
FileUnderground knowyour antimatterrisks.png|Fourth poster, "''Know your... Anti-Matter Risks''", cut from the final game. The image was kept for a FileUnderground bonobos01.png|sign seen above Test Chamber 27 in Sphere 03.
FileUnderground knowyour isotopes.png|Fifth poster, "''Know your... Radioactive Isotopes''", cut from the final game.
FileUnderground paradoxes01.png|Sixth poster, "''Know your... Time Travel Paradoxes''", cut from the final game ''Always avoid... Future Self / Your Father / Past Self / Hitler''.
FileInteractive console display skin1.png|Schematics of the Repulsion Gel flow through the 6 Mobility Gel Enrichment Spheres featured in Test Shaft 09 as seen on the console in Pump Station Alpha.
FileGel pressure control blue.png|Blue "Gel Pressure Control" notice on the console in Pump Station Alpha.
FileUnderground safetyfirst.png|''Safety First Together we can make 1956 the lowest unexpected casualty annum ever!'' poster featured on top of Pump Station Alpha.
FileYou are here Test Shaft 09 Portal 2.png|"You are here" sign featured at the start of Sphere 01, showing an incorrect number of Enrichment Spheres.
FileUnderground start 00.png|"Enter" stencil featured several times in the Spheres.
FileUnderground oldportalgun.png|"Portable Quantum Tunneling Device" poster seen before Test Chamber 01 in Sphere 01.
FileUnderground repulsion.png|"''Aperture Science Fact Placard - Repulsion Gel''" poster found at the start of Test Chamber 01 in Sphere 01.
FileSignage paint jump 50s.png|Repulsion Gel sign.
FileApparatus vent sign 50s.png|Early Apparatus Vent sign.
FileTestchamber mark.png|Early target sign used to indicate where to shoot portals.
FileUnder exit sign.png|Early exit sign.
FileUnderground nextchamber.png|"Next Test Chamber this way" stencil featured under Test Chamber 02 in Sphere 01.
FileUnderground futureyou.png|"Future you" sign as found outside Test Chamber 27 in Enrichment Sphere 03.
FileUnderground bonobos01.png|"Accidents hurt" sign as found above Test Chamber 27, named "bonobos01" in the game files.
FileUnderground exit 01.png|"Thank you for your participation" sign found in the Main Lift lounge at the end of the 1950s area.
FileUnderground tosurface01.png|"Elevator to the surface" sign seen left of the Main Lift at the end of the 1950s area.
|-
|}
===1970s levels Propulsion Gel===
FilePortal2 2011-05-28 21-32-53-18.jpg|200px|left|thumb|Inside Pump Station Beta.
The Mobility Gels tested in this level era are the Repulsion Gel and the newly introduced Propulsion Gel.
Of note is that the timeline jumps from the late 1950s to the early 1970s, as the Shaft was condemned in 1961 to be reopened in the early 1970s.
====1971 Pump Station Beta====
As the Main Lift is disabled, Chell must portal herself from the 1950s exit area to the next set of Spheres, starting with Pump Station Beta, built in 1971, and pumping Propulsion and Repulsion Gels.
Inside Pump Station Beta, Chell portals herself to the top of the deep room and powers back the two pumps in rooms made in a typical 70s style, with wooden walls and an orange tiled floor, as well as typical white and orange 70s objects.
====1971 Entrance Way====
FilePortal2 2011-06-19 14-53-49-34.jpg|200px|right|thumb|What Test Subjects would see upon arriving the Control Room and Test Subject Waiting Area on the left, Pump Station Beta on the right, and Enrichment Sphere 04 in the middle, behind a large 70s Aperture logo.
Reaching the area where Test Subjects would arrive from the Main Lift in the 1970s, Chell can hear the original welcome message
{{Quotation|- Cave ''Greetings, friend. I'm Cave Johnson, CEO of Aperture Science - you might know us as a vital participant in the 1968 Senate Hearings on missing astronauts. And you've most likely used one of the many products we invented. But that other people have somehow managed to steal from us. Black Mesa can eat my bankrupt--''
- Caroline ''Sir, the testing?''
- Cave ''Right. Now, you might be asking yourself, 'Cave, just how difficult are these tests? What was in that phone book of a contract I signed? Am I in danger?''
''Let me answer those questions with a question Who wants to make sixty dollars? Cash.''
''You can also feel free to relax for up to 20 minutes in the waiting room, which is a damn sight more comfortable than the park benches most of you were sleeping on when we found you.''
''So. Welcome to Aperture. You're here because we want the best, and you're it. Nope. Couldn't keep a straight face.''
''Anyway, don't smudge up the glass down there. In fact, why don't you just go ahead and not touch anything unless it's test related.''}}
Ten years about the Shaft condemnation, it appears that Aperture has suffered major issues astronauts hired for testing in the 50s appear to have disappeared, leading to Senate Hearings about their disappearances; Aperture also seems to have been victim of industry espionage by competitor Black Mesa; finally, these issues appear to have led Aperture to hire Test Subjects off the street, paying as low as $60 to risk their lives in the Test Chambers. Cave also repeats the sentence said in the 50s, "You're here because we want the best, and you are it", except that now he does not believe in it, since the new Test Subjects are no longer the best.
FilePortal2 2011-06-19 15-00-21-25.jpg|200px|left|thumb|The cracked wall left of the Main Lift access.
In a welcome area very similar to the one seen in the 50s, upon leaving the Main Lift Test Subjects would be met with a large yellow sign with on it "''Welcome to Aperture / Where the science is theoretical ...but your $60 is fact!''". Beyond is a large faded orange metal logo shows that at that time the "Aperture Science Innovators" brand had been changed to simply "Aperture". Test Subjects would go through the aperture of that Aperture logo to board the elevator leading to Enrichment Sphere 04, after leaving the ground with a platform started from the Control Room on the left. Left of the platform is a sign showing the way to the Test Subject Waiting Area, with on it the words "''Keep to the left / Do not litter / Do not loiter / Do not touch glass.''".
The Main Lift access is still condemned, and inside can be seen a 3975 m depth. The wall left of the elevator access is heavily damaged, and the catwalk originally tied to it was damaged as well, preventing from reaching an office above. Chell portals herself to that office, and accesses a corridor from a door located behind a large computer.
====''Borealis''’ drydock====
FileBorealis drydock.jpg|thumb|right|200px|The ''Borealis''' empty drydock.
In the corridor can be found four doors leading to vitrified Test Chambers, one of them having been blasted on the floor. Each of the three shut doors has an interphone, which when powered will give the following prerecorded messages by Johnson about what crazy tests they involve, reminiscent of what was heard at the bottom of the Shaft
{{Quotation|''- If you're allergic to peanuts, you might want to tell somebody now, because this next test may turn your blood into peanut water for a few minutes. On the bright side, if we can make this happen, they're gonna have to invent a new type of Nobel Prize to give us, so hang in there.''
''- The average human male is about sixty percent water. Far as we're concerned, that's a little extravagant. So if you feel a bit dehydrated in this next test, that's normal. We're gonna hit you with some jet engines, and see if we can't get you down to twenty or thirty percent.''
''- All right. We're working on a little teleportation experiment. Now, this doesn't work with all skin types, so try to remember which skin is yours, and if it doesn't teleport along with you, we'll do what we can to sew you right back into it.''}}
If the player listens to these three messages as well as the three in the 50's area, they receive the achievement "Door Prize."
The opened door leads to a large and empty drydock that used to house the ''Borealis'' before the experiment performed there made it disappear to an Arctic location. A barrier prevents from going into the drydock itself, and several life preservers bearing the ship's name are scattered on the floor. The drydock was also vitrified, as seen on the blasted door by noclipping.
Finding the ''Borealis'' earns the player the achievement "Ship Overboard."
====Control Room and Test Subject Waiting Area====
=====Test Subject Waiting Area=====
FilePortal2 2011-05-28 22-16-30-37.jpg|200px|left|thumb|Inside the Test Subject Waiting Area.
Back into the welcome area, below the office leading to the ''Borealis''’ drydock is a two-story building. The ground floor is for Test Subject reception. The entrance hall features the portrait of an older Cave Johnson from the 1970s, now with sideburns. The Test Subject Waiting Area follows, in which Test Subjects had to take a numbered waiting ticket before being called for testing (when it was last used, the next ticket was 426, while the next Test Subject to go was 23). Two images on the wall also promote the promised $60. The floor also houses two offices with plants that dried out long ago. One office features a poster asking Aperture employees to alert their supervisor if they see the following WikipediaOccupational Safety and Health Administration|OSHA Inspector, WikipediaUnited States Department of Energy|Dept of Energy Inspector, WikipediaGovernment Accountability Office|GAO accountant, undercover police officer, WikipediaNuclear Regulatory Commission|Nuclear Regulatory Commissioner, WikipediaFederal Emergency Management Agency|FEMA Coordinator, ordinary police officer, journalist, Public Works Inspector, WikipediaMine Safety and Health Administration|MSHA Mine Inspector, WikipediaBureau of Alcohol, Tobacco, Firearms and Explosives|ATF / WikipediaFederal Bureau of Investigation|FBI / WikipediaUnited States Marshals Service|US Marshal.
=====Control Room=====
FilePortal2 2011-05-28 22-19-25-85.jpg|200px|right|thumb|Inside the Control Room, with PotatOS and the bird in the latter's nest.
The Control Room room above is not connected to the waiting area, and was presumably accessed from catwalk stairs now missing. There are further desks, and in a small room the Elevator Control button that operates the platform leading to Sphere 04's elevator.
There Chell reunites with PotatOS, being pecked by the bird in its nest after the latter grabbed her in the Tartaros area, showing it was able somehow to follow Chell inside the shaft. PotatOS asks Chell to "murder" the bird as she is "good at murder." If Chell doesn't do so, PotatOS asks to "just kill it," then simply get the bird off her. When Chell gets closer, the bird escapes. PotatOS tells Chell how important it is that Wheatley is disconnected. The AI then bargains to be taken with Chell, since she states she must replace Wheatley before he completely destroys the facility. Chell sticks one of her ASHPD's appendages into the potato, in the process releasing the Elevator Control button hidden in the nest. Shortly after, PotatOS "passes out". As Chell cannot activate the button and be on the platform at the same time, she portals herself to it, going again through the Aperture logo before reaching the platform from the other side through momentum.
====1972 Enrichment Sphere 04====
FilePortal2 2011-05-31 00-07-49-00.jpg|200px|left|thumb|Inside Test Chamber 01.
This starts the seventh chapter, ''The Reunion'', and tests with both the Repulsion and Propulsion Gels.
At the start, the following message is heard
{{Quotation|- Cave ''The testing area's just up ahead. The quicker you get through, the quicker you'll get your sixty bucks.''
''Caroline, are the compensation vouchers ready?''
Caroline ''Yes sir, Mr. Johnson!''}}
PotatOS oddly reacts to the message, answering to Johnson the same words as that of Caroline. After realizing what just happened, PotatOS suffers a panic attack and shorts out temporarily. This is the first clue of a connection between GLaDOS and Caroline.
=====Test Chamber 01=====
FileCave caroline 70s.png|100px|right|thumb|The portrait of Cave and Caroline in the 1970s.
This chamber, dated 1972, requires coupling the Propulsion Gel with a ramp. A pylon has fallen into the chamber, partially destroying a wall. At the end can be seen a large sign, reminding several things to Test Subjects "''Do not leave your belongings here / loiter for more than twenty minutes / touch the glass''", and "''Do wear a shirt and shoes at all times / move quickly through your test track / not forget to not touch the glass''".
On the catwalks between Test Chamber 01 and 02 can be seen a sign ask to remember the following "''If you see an orange jumpsuit, hit the red button''", with a the image of Test Subject with a bindle seemingly escaping. Nearby Chell has the ability to portal herself to Test Chamber 01's observation room, where a portrait of Cave and Caroline at his side{{YouTube|lR2UyCwtj-U|Talking with Caboos15 Ellen McLain plus surprise guest}} can be found, unlocking the Portal 2 Achievements and Trophies|Achievement "Portrait of a Lady". To this, PotatOS comments "''Those people, in the portrait. They look so familiar...''". Behind the couple is a bookshelf, and on the left what may be the statue of an unknown individual. In the room, two posters previously seen in the Test Subject Waiting Area can be found.
=====Test Chamber 02=====
FilePortal2 2011-05-28 22-52-18-78.jpg|200px|left|thumb|Right outside Test Chamber 02.
In this chamber, also dated 1972, the Propulsion Gel must be combined with the Repulsion Gel. At the end of the chamber, the following message is heard
{{Quotation|''Great job, astronaut, war hero, and/or Olympian! With your help, we're gonna'' tape cuts out - actually ''change the world''
''This on?'' thump thump ''Hey. Listen up down there. That thing's called an elevator. Not a bathroom.''}}
Here it appears that a tape from the 50s was reused and that there was a mix-up with the tapes, as at that time astronauts, war heroes and Olympians are no longer hired as Test Subjects. This is evidenced by the tape cutting out before the end of the sentence, Cave then asking Test Subjects to not defecate in the elevator, more appropriate for hobos hired of the street.
PotatOS comments she swears she knows the voice.
====1976 Enrichment Sphere 05====
=====Test Chamber 05=====
FilePortal2 2011-05-28 23-07-37-82.jpg|200px|right|thumb|Overview of Sphere 05.
At the start of the sole chamber found in Sphere 05, dated 1976, the following message is heard
{{Quotation|''If you're interested in an additional sixty dollars, flag down a test associate and let 'em know. You could walk out of here with a hundred and twenty weighing down your bindle if you let us take you apart, put some science stuff in you, then put you back together good as new.''}}
Here Johnson bargains for a few more dollars, promising dangerous operations to Test Subjects.
The chamber requires the Propulsion Gel to be combined with the Repulsion Gel through a set of different platforms, combined with a Cube, Portals, and a ramp. This is very reminiscent to the later levels of ''Tag The Power of Paint'', from which the Mobility Gels were inspired.
At the end of the Sphere, the following message is heard
{{Quotation|''In case you're interested, there's still some positions available for that bonus opportunity I mentioned earlier. Again all you gotta do is let us disassemble you. We're not banging rocks together here. We know how to put a man back together.''
''So that's a complete reassembly. New vitals. Spit-shine on the old ones. Plus we're scooping out tumors. Frankly, you oughtta be paying us.''}}
Cave insists again on the previous opportunity of being disassembled then reassembled, suggesting Aperture was also working on artificial organs.
====1978 Elevator access====
FilePortal2 2011-05-28 23-13-10-90.jpg|200px|left|thumb|The corridor leading to the elevator.
This section, dated 1978, marks the end of the 1970s levels. Above, the Test Subject Waiting Area for the Conversion Gel can be seen. On the catwalk out of Sphere 05, the following message is heard
{{Quotation|''Thank you - I can't believe I'm thanking these people - for staggering your way through Aperture Science's Propulsion Gel testing. You've made some real contributions to society for a change, and for that, humanity is grateful.''
''If you had any belongings, please pick them up now. We don't want old newspapers and sticks cluttering up the building.''
''For many of you, I realize 60 dollars is an unprecedented windfall, so don't go spending it all on... I don't know. Caroline, what do these people buy? Tattered hats? Beard dirt?''}}
This end message is similar to the one heard at the end of the 50s, but much less respectful, and rather disdainful.
FilePortal2 2011-05-28 23-13-32-28.jpg|200px|right|thumb|The condemned Main Lift.
The catwalk leads to a L-shaped corridor ending at the Main Lift access. Near the first corner, a sign reads "''Thank you for not loitering longer than 20 minutes''". Left of the elevator access, and facing three chairs, is a small booth in which a chair, a desk, a phone and a portable TV can be found. On its side, the following sign reads "''All forms must be filled out legibly and completely before eligible to recieve'' sic ''payment of $60''", showing "$60" was changed from another sum. The elevator access is still condemned, and on it can be found the same "out of service" sign found in the 1950s Entrance Way.
Chell portals herself on catwalks above, and beyond a heavy door she is back in the shaft. Catwalks used to lead to Pump Station Gamma, but as they are destroyed, Chell portals herself beyond the gap.
====Gallery====
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FilePortal2 2011-05-28 21-33-54-67.jpg|Outside Pump Station Beta.
FilePortal2 2011-05-28 21-35-38-45.jpg|Inside the station.
FilePortal2 2011-05-28 21-32-14-46.jpg|The control room.
FilePortal2 2011-05-28 21-31-23-37.jpg|The console in the control room.
FilePortal2 2011-05-28 21-36-05-40.jpg|Fizzler as seen from the corridor after the control room.
FilePortal2 2011-05-28 22-06-38-31.jpg|Overall view of the 1970s welcome area.
FilePortal2 2011-05-28 22-10-17-31.jpg|Control Room and Test Subject Waiting Area building.
FilePortal2 2011-05-28 22-08-55-15.jpg|What Test Subjects would seen upon arriving.
FilePortal2 2011-05-28 22-13-32-03.jpg|A bit farther, the platform bringing Test Subjects to Sphere 04.
FilePortal2 2011-05-30 23-42-16-17.jpg|Enrichment Sphere 04 towering over the 1970s welcome area.
FileSphere 05 models.jpg|Isolated view of the models making up Enrichment Sphere 04, viewed in Hammer.
FilePortal2 2011-05-28 22-08-11-64.jpg|Down the elevator shaft at the welcome area level.
FilePortal2 2011-05-28 21-53-23-82.jpg|Inside the building located above the Control Room and Test Subject Waiting Area building.
FilePortal2 2011-05-28 21-53-38-79.jpg|Ditto.
FilePortal2 2011-05-28 21-44-18-04.jpg|The hidden door leading to the ''Borealis''’ drydock and other Test Chambers.
FilePortal2 2011-05-28 21-38-39-43.jpg|The corridor beyond the hidden door.
FilePortal2 2011-05-28 21-39-35-48.jpg|The blasted door leading to the ''Borealis''’ drydock.
FilePortal2 2011-06-20 23-52-11-46.jpg|Portrait of Cave Johnson seen upon entering the Test Subject Waiting Area level.
FilePortal2 2011-05-28 22-15-51-06.jpg|Office adjacent to the Test Subject Waiting Area.
FilePortal2 2011-05-28 22-16-11-25.jpg|The office that follows.
FilePortal2 2011-05-28 22-16-46-26.jpg|Ticket dispenser and poster in the Test Subject Waiting Area.
FilePortal2 2011-05-28 22-17-02-23.jpg|Chairs and poster in the Test Subject Waiting Area.
FilePortal2 2011-05-28 22-17-49-18.jpg|Outside the Control Room above.
FilePortal2 2011-05-28 22-20-57-34.jpg|The bird watching over PotatOS in its nest.
FilePortal2 2011-05-28 22-23-54-45.jpg|After the bird has flown away, Chell sticks one of her ASHPD's appendages into the potato, triggering the previously hidden Elevator Control button in the process, which elevates the platform leading to Sphere 04's elevator.
FilePortal2 2011-05-28 22-24-06-09.jpg|The platform finishes rising.
FilePortal2 2011-05-28 22-29-14-09.jpg|Chell after reaching the platform by using her portals.
FilePortal2 2011-05-31 00-06-18-35.jpg|Raised springboard inside Sphere 04's Test Chamber 01.
FilePortal2 2011-05-31 00-05-23-68.jpg|Access granted to Sphere 04's Test Chamber 02.
FilePortal2 2011-05-28 22-43-20-01.jpg|Test Chamber 02's control room, with a glimpse of Cave and Caroline's portrait inside.
FilePortal2 2011-05-28 22-47-57-90.jpg|Sign after Test Chamber 02.
FilePortal2 2011-05-28 22-49-03-59.jpg|Inside Test Chamber 02's control room, with Cave and Caroline's portrait on the right.
FilePortal2 2011-05-28 22-51-54-75.jpg|Working Repulsion Gel vent in Test Chamber 02.
FilePortal2 2011-05-28 22-54-23-54.jpg|View of the end of Test Chamber 02's test, leading to the elevator on the left.
FilePortal2 2011-05-28 22-57-59-70.jpg|Modern Propulsion and Repulsion Gel signs after leaving the elevator in Sphere 05's unique Test Chamber.
FilePortal2 2011-05-28 23-08-48-42.jpg|Vital Apparatus Vent in Enrichment Sphere 05.
FilePortal2 2011-05-28 23-09-09-76.jpg|Propulsion and Repulsion Gel vents in Sphere 05.
FilePortal2 2011-05-28 23-13-50-59.jpg|The booth left of the Main Lift at the end of the 70s area.
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!class="article-template" align=center bgcolor= colspan=3|''Logos, signs and posters
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FileLoadingscreen default d 4 widescreen.png|The Aperture logo as used in the loading screen.
FileUnderground sphere 004.png|Cut Sphere 04 sign "Tango Franklin".
FileUnderground sphere 005.png|Cut Sphere 05 sign "Juliet Planck".
FileGel flow orange.png|Propulsion Gel "Gel Flow" direction.
FileUnderground pumpstation beta01.png|"Pump Station Beta" stencil.
FileInteractive console display skin2.png|Schematics of the Propulsion Gel flow through the 6 Mobility Gel Enrichment Spheres featured in Test Shaft 09 as seen on the console in Pump Station Beta, with a small Pump Station Alpha in the bottom.
FileGel pressure control orange.png|Orange "Gel Pressure Control" notice on the console in Pump Station Beta.
FileUnderground 70swelcome.png|"''Welcome to Aperture / Where the science is theoretical ...but your $60 is fact!''" sign.
FileAperture metal logo 70s.jpg|Aperture metal sign featured under Enrichment Sphere 04.
FileAperture 70s.svg|Ditto, vector version.
FilePortal2 poster 70s credits.jpg|The modern Aperture logo replacing the 70s one in a 70s style poster for ''Portal 2''.
FileControl room sign.png|Control Room sign.
FileUnderground 70s sign1.png|"''Keep to the left''" sign.
FileUnderground 70s walkway sign1.png|"''Moving Platform / Use handrails''" warning sign.
FileCave johnson 70s.png|Portrait of Cave Johnson in the 1970s, featured before the Test Subject Waiting Area.
FileUnderground 70s accidents.png|Sign first seen in an office near the Test Subject Waiting Area, reminding Aperture employees to alert their supervisor if they see individuals from a following list, from state representatives to mere journalists.
FileUnderground waiting 01.png|Test Subject Waiting Area stencil.
FileTicket dispenser please.png|Ticket dispenser sign.
FilePopart70s 02.png|Poster luring Test Subjects into thinking their $60 will one day allow them to buy a yacht.
FilePopart70s 01.png|Happy Test Subject clutching dollars in his hands.
FileSignage paint speed.png|Modern Propulsion Gel sign.
FileUnderground exit 01a.png|"''Thank you for keeping the Enrichment Spheres clean''" sign.
FileUnderground knowyour01.png|The "Do not / Do" sign featured at the end of Sphere 04's Test Chamber 01.
FileUnderground 70s redbutton.png|"''Hit the red button''" sign.
FileSignage paint jump.png|Modern Repulsion Gel sign.
FileUnderground exit 01b.png|"''Thank you for not loitering longer than 20 minutes''" sign.
FileUnderground 70s sign2.png|Notice seen on the booth left of the Main Lift at the end of the 70s area.
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===1980s levels Conversion Gel===
The Mobility Gel tested in this level era is the Conversion Gel.
====1982 Pump Station Gamma====
FilePump Station Gamma Test Shaft 09 Portal 2.jpg|200px|right|thumb|Conversion Gel spreading in Pump Station Gamma.
Scaffoldings can be seen outside and above the Pump Station, dated 1982, suggesting some elements were never completed.
Inside the station, PotatOS wonders who this Caroline might be, and if she might have killed her. She suddenly stops, troubled, and tells Chell she is doing great job, then stops speaking after saying she needs to think.
The Pump Station is made of three pumps, one for each Mobility Gel, which Chell restarts at the console. The 1980s are conveyed through white-colored devices, and a white-colored wall decorated with a light-blue colored line at the top. As the pumps are leaking, Gel particles are spread in several places in the pump station. As the only way to exit the station is by reaching its upper level, Chell uses the leaked Gels to her advantage to portal herself on top of the station as the catwalks leading to it are gone, and avoids eight deadly pistons in the process.
Before exiting the station, a poster can be seen, promoting Aperture Science Robot Worker|robot workers replacing human employees and encouraging the latter to volunteer for testing. It starts with the sentence "''Karla the complainer says... ‘My new boss is a robot!’''". Right after, "''But did you know?''" introduces the three following sentences "''Robots are SMARTER than you''", "''Robots work HARDER than you''", "''Robots are BETTER than you''". Under is a picture of "Karla the complainer" sitting at a desk, with standing in front of her her "new boss", a robot wearing a tie and holding a cup. "''Volunteer for testing today''" is written under the image.
FileFlying Crow Test Shaft 09 Portal 2.jpg|200px|left|thumb|The crow flying off after Chell opens the door from the pump station.
Back into the shaft, the crow can be found flying off from the catwalk, making PotatOS scream and asking Chell to kill it. Spheres 05, 06 and 07 can be seen. The catwalk would lead to the next Test Subject Waiting Area, and as usual, as it is destroyed, Chell portals herself beyond the gap by using spilled Propulsion Gel inside the Pump Station.
During this era, the current "Aperture Laboratories" brand was introduced. The ''Portal 2'' game files reveal that a model for a large and damaged metal version of that logo variant was to be seen somewhere, in a similar fashion to that of the previous era levels, but it was ultimately scrapped, although it replaces the 70s logo in a FilePortal2 poster 70s no credits.jpg|''Portal 2'' 70s style poster.
====Combataton Testing Area====
Under the Test Subject Waiting Area can be found a small platform with a door leading to a vitrified "Combataton Testing Area" with a warning saying "''Remain still if you are targeted''". It is unknown what is behind this door.
====1981 Test Subject Waiting Area====
FilePortal2 2011-07-03 18-57-58-18.jpg|200px|right|thumb|Outside the Test Subject Waiting Area.
This is where the Aperture employees would wait before testing. Above the main building can be seen two other inaccessible buildings. Upon entering the Waiting Area, dated 1981, the following message is heard
{{Quotation|''Welcome to the Enrichment Center.'' cough
''Since making test participation mandatory for all employees, the quality of our Test Subjects has risen dramatically. Employee retention, however, has not.''
cough ''As a result, you may have heard we're gonna phase out human testing. There's still a few things left to wrap up, though.''
''The bean counters told me we literally could not afford to buy seven dollars worth of moon rocks, much less seventy million. Bought 'em anyway. Ground 'em up, mixed em into a gel.''
''And guess what? Ground up moon rocks are pure poison. I am deathly ill.''
''Still, it turns out they're a great portal conductor. So now we're gonna see if jumping in and out of these new portals can somehow leech the lunar poison out of a man's bloodstream. When life gives you lemons, make lemonade.'' coughs ''Let's all stay positive and do some science.''
''That said, I would really appreciate it if you could test as fast as possible. Caroline, please bring me more pain pills.''}}
Now Aperture is not even able to hire hobos off the street anymore, and is forced to recruit among its employees, replacing them (as evidenced by several posters) by Aperture Science Robot Worker|robots, which also sees the numbers of employees diminishing, while their quality is higher than that of hobos. Human testing however is said to be soon phased out, but that experiments with the Conversion Gel, made of ground moon rocks, must first take place. The rocks are however poisonous, and have poisoned Johnson, Half-Life WikiRetcons|retconning the original nature of its poisoning, which originally was with mercury.ApertureScience.com "When life gives you lemons, make lemonade." is a common phrase, and Johnson will get back to it at the end of the - 1986 Enrichment Sphere 06|latest test.
Inside, a small sign "''Enrich yourself today - volunteer for testing''" is found. The area is dimly-lit with a cold light. The overall colors are greyish-blue and white, and is closer in design to the offices of the modern Enrichment Center. Another sign, titled "''Know your paradoxes (!) in the event of a rogue AI''", is found. It advises employees to ''"1. Stand Still, 2. Remain calm, 3. Scream ‘This statement is false! New mission Refuse this mission! Does a set of all sets contain itself?’"''.
FileWaiting Area Test Shaft 09 Portal 2.jpg|200px|left|thumb|In the Waiting Area.
The Waiting Area, below, is accessed through a smashed window. It appears Aperture employees volunteering for testing would come through a door smaller than in the two previous areas (while it likely connects to the Main Lift as well, though it is not directly seen here). Next is the last portrait of Cave Johnson, appearing older and ill. Left is a door leading to the proper Waiting Area, right is a door to the Control Room, a small office where a button opening the door to the next sphere is found. There the "Karla the complainer" poster is seen again, along with another similar poster with "''Remember... robots don't sleep''", followed by "''They can test and do your job''" and the picture of a robot worker testing and sorting paperwork very fast behind a desk at the same time, finally followed by the words "''Volunteer for testing today''". Inside the Waiting Area can be found a poster titled "Aperture Science - Let's work together", with a robot worker and human employee wearing labcoats and walking hand in hand in front of a sunset, the sun being Aperture Science's aperture logo. The room contains several chairs, and a projector directed toward a white screen, on which motivational videos or other things were probably played. A catwalk leads to Enrichment Sphere 06, and a warning sign reads "''Please do NOT test if - You are allergic to lunar sediment and/or starch; - You have fulfilled your monthly self-election quota; - You are confident enough in your work performance to unvolunteer from the test self-election process''". There is no fizzler before the elevator; an unseen one is used instead in the elevator tube.
====1982 - 1986 Enrichment Sphere 06====
FileEnrichment Sphere 06 Test Shaft 09 Portal 2.jpg|200px|right|left|thumb|Conversion Gel flowing in Enrichment Sphere 06.
Built from 1982 to 1986, it consists of a single Test Chamber, filling half of the sphere, though the numbers 01 and 02 are seen on two columns. It is the only Sphere testing the Conversion Gel, which is not used with the conjunction of any other gel. The ceiling is uncompleted, allowing to see Sphere 07 above.
After Chell completes the test, the latest pre-recorded message is heard, in which a demented Johnson has his now infamous rant about the lemons, to which PotatOS reacts enthusiastically (it has since become a famous Internet memehttp//knowyourmeme.com/memes/cave-johnson-combustible-lemons Cave Johnson / Combustible Lemons on Know Your Meme), and putting someone's brain into a computer, one of the hints that Caroline's mind was used to create GLaDOS
{{Quotation|''All right, I've been thinking. When life gives you lemons? Don't make lemonade. Make life take the lemons back! Get mad! 'I don't want your damn lemons! What am I supposed to do with these?''
''Demand to see life's manager! Make life rue the day it thought it could give Cave Johnson lemons! Do you know who I am? I'm the man who's going to burn your house down! With the lemons! I'm going to get my engineers to invent a combustible lemon that burns your house down!'' heavy cough
''The point is If we can store music on a compact disc, why can't we store a man's intelligence and personality on one? So I have the engineers figuring that out now.''
''Brain Mapping. Artificial Intelligence. We should have been working on it thirty years ago. I will say this - and I'm gonna say it on tape so everybody hears it a hundred times a day If I die before you people can pour me into a computer, I want Caroline to run this place.'' cough
''Now she'll argue. She'll say she can't. She's modest like that. But you make her.'' cough
''Hell, put her in my computer. I don't care.''
''Allright, test's over.'' cough ''You can head on back to your desk.''}}
After the message, PotatOS says "Goodbye, sir."
====Enrichment Sphere 07====
FileEnrichment Sphere 07 Test Shaft 09 Portal 2.jpg|200px|left|thumb|The unvisited Enrichment Sphere 07, with Sphere 06 in the foreground.
The seventh and last Enrichment Sphere cannot be visited and appears to be not connected to any part of the shaft, except for Conversion Gel tubes going through it from the Pump Station to Sphere 06. It is not present on the screens of the three consoles operating the Pump Stations, suggesting it was never used in Mobility Gel testing.
====1982 Elevator access====
FileAccess to Main Lift Test Shaft 09 Portal 2.jpg|200px|right|thumb|The access to the Main Lift, now granted.
The elevator access, dated 1982, starts with a sign thanking employees for volunteering, followed by the words "''Please return to your desk and await further opportunities''", a small booth, then a small door to the Main Lift shaft, which is now accessible. The depth is now 3000 m. Since the elevator is out of order, Chell portals herself up the shaft. The elevator is stuck at around 2912 m. Chell finally leaves the elevator shaft through a maintenance door, located slightly above 2900 m, to get back into Test Shaft 09, now at its uppermost level, at a set of platforms built over Sphere 07. After PotatOS attempts to cheer Chell up, the latter goes through a set of several platforms by using leaking pipes of each Mobility Gel (somehow replacing the inaccessible last sphere in a last test), to finally arrive in the main Gel Pump Station through a maintenance shaft.
====Gallery====
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FileCollapsed Platform Test Shaft 09 Portal 2.jpg|Pump Station Gamma as seen from the collapsed platform accessed from the 70s elevator accessed.
FileThree Mobility Gel Consoles Test Shaft 09 Portal 2.jpg|The three Mobility Gel consoles in Pump Station Gamma.
FilePoster in Pump Station Gamma Test Shaft 09 Portal 2.jpg|"My new boss is a robot" poster in Pump Station Gamma.
FilePistons and Propulsion Gel covered Floor Test Shaft 09 Portal 2.jpg|The pistons and the Propulsion Gel-covered floor in Pump Station Gamma.
FileVirtified Combaton Testing Area Test Shaft 09 Portal 2.jpg|The access to the vitrified Combataton Testing Area.
FileOutside Test Subject Waiting Area Building Test Shaft 09 Portal 2.jpg|Outside the Test Subject Waiting Area building.
FileEntrance to TSWABTest Shaft 09 Portal 2.jpg|The entrance to the Test Subject Waiting Area building.
FileTest Subject Waiting Area Building Test Shaft 09 Portal 2.jpg|The "Know your paradoxes" sign in the Test Subject Waiting Area building.
FileOffice Test Shaft 09 Portal 2.jpg|Office above the Test Subject Waiting Area.
FileAccess to Main Lift 2 Test Shaft 09 Portal 2.jpg|What may be the access to the Main Lift.
FilePortal2 2011-06-22 18-31-36-29.jpg|The last portrait of Cave Johnson, sick during the 80s.
FileControl Room Test Shaft 09 Portal 2.jpg|The Control Room adjacent to the Test Subject Waiting Area.
FileWarning sign Test Shaft 09 Portal 2.jpg|Warning sign on the catwalk before Enrichment Sphere 06.
FileEnrichment Sphere 06 2 Test Shaft 09 Portal 2.jpg|Enrichment Sphere 06 as seen from above.
FileFlowing Convesion Gel Test Shaft 09 Portal 2.jpg|Flowing Conversion Gel in Enrichment Sphere 06's sole Test Chamber.
FileConversion Gel Test Shaft 09 Portal 2.jpg|Conversion Gel placed properly to complete Sphere 06.
FileFlooded Sphere 06 Test Shaft 09 Portal 2.jpg|Sphere 06 can be completely flooded with Conversion Gel.
FileExit after Sphere 6 Test Shaft 09 Portal 2.jpg|The exit after Sphere 06.
FileCatwalk Test Shaft 09 Portal 2.jpg|The catwalk leaving Sphere 06, with Pump Station Gamma's tanks below.
FileThank you Sign Test Shaft 09 Portal 2.jpg|Sign thanking Aperture employees for taking part into testing, at the Main Lift access at the end of the 80s area.
FilePortal2 2011-05-28 23-49-35-09.jpg|Inside the Main Lift booth.
FileMain Lift Shaft Test Shaft 09 Portal 2.jpg|Low-angle shot of the 80s part of the Main Lift shaft, with on the very top one of the several couples of horizontal sliding blast doors isolating each era's elevator shaft from the others.
FileShaft beyond Blast Doors Test Shaft 09 Portal 2.jpg|The shaft beyond the blast doors, with the elevator stuck on the very top.
FileMaintainance Booth Test Shaft 09 Portal 2.jpg|Maintenance booth set within the shaft.
FileEntire Main Lift Test Shaft 09 Portal 2.jpg|The Main Lift itself, stuck along its railings.
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{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Logos, signs and posters
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FileUnderground sphere 006.png|Cut Sphere 06 sign "Hotel Kepler".
FileUnderground sphere 007.png|Cut Sphere 07 sign "November Brahe".
FileAperture metal logo 80s.jpg|Damaged Aperture Laboratories logo cut from the final game.
FileUnderground pumpstation gamma01.png|"Pump Station Gamma" stencil.
FileInteractive console display skin0.png|Schematics of the Propulsion Gel flow through the 6 Mobility Gel Enrichment Spheres featured in Test Shaft 09 as seen on the console in Pump Station Gamma, with Pump Stations Alpha and Beta in the bottom.
FileGel pressure control white.png|White "Gel Pressure Control" notice on the console in Pump Station Gamma.
FileKeep out.png|"Keep out" sign seen before the pistons in Pump Station Gamma.
FileUnderground pistons.png|"''Notice Due to architectural flaw, please do not exit room while pistons are active''" sign removed from the final game, which probably was to be found in Pump Station Gamma.
FileRobotposter1.png|"''My new boss is a robot''" poster.
FileUnderground combataton.png|"Combataton Testing Area" stencil.
FileWatch your step.png|Caution sign featured outside the Test Subject Waiting Area.
FileUnderground 80s enrich.png|"''Enrich yourself today''" poster.
FileUnderground 80s paradoxes.png|"''Know your paradoxes''" sign.
FileCave johnson 80s.png|Portrait of Cave Johnson in the 1980s, featured before the Test Subject Waiting Area.
FileRobotposter2.png|"''Robots don't sleep''" poster.
FileRobotposter3.png|"''Let's work together''" poster.
FileProjector screen.png|Aperture logo on the projector screen featured in the Test Subject Waiting Area.
FileUnderground caution remote door1.png|80s style caution / attendant sign featured before the elevator going to Enrichment Sphere 06.
FileUnderground warning whitegel.png|Warning sign featured before the elevator.
FileUnderground exit 02.png|Sign located at the Main Lift access at the end of the 80s area, thanking Aperture employees for taking part into testing.
FileUnderground futureyou2.png|"Future you" sign, 80s style, removed from the final game, with a variant of the FileUnderground futureyou.png|50s text ''"Remember If a future you tries to warn you about this experiment, do not listen."''.
FileUnderground geothermal black.png|Stencil for the "Geothermal Power Plant 3" removed from the final game.
FileUnderground geothermal warning.png|Notice for the cut Geothermal Power Plant 3 "''Employees are reminded that there is NOTHING OF INTEREST present in the geothermal power wing. Any employees investigating further will be TERMINATED IMMEDIATELY due to the complete lack of anything of note present therein.''", also removed from the final game.
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===Gel Pump Station===
FileArea between Sphere 7 and Gas Pump Station Test Shaft 09 Portal 2.jpg|200px|left|thumb|The area between Sphere 07 and the Gel Pump Station.
The Gel Pump Station pumps Mobility Gels from below into the modern facility. Larger than the three previous ones, it also contains Transition Seal 02, the other hatch sealing off access to the shaft, and leading to the modern facility. The hatch can be opened with a Hatch Override button located in a booth to which Chell portals herself. Inside, the "paradoxes" sign first seen in the 80s Test Subject Waiting Area is seen again, and PotatOS suggests they use paradoxes to defeat Wheatley.
Upon opening Transition Seal 02, the Mobility Gel connection to the modern facility is restored, and a platform lowers to receive Chell and PotatOS. While ascending, the A.I. talks again about her plans to overthrow Wheatley.
FileOverview of Gel Pump Station Test Shaft 09 Portal 2.jpg|200px|right|thumb|Overview of the Gel Pump Station.
Then they find herselves right under the modern facility, which appears to rest not only on giant numbered pillars but on giant numbered springs as well, reminiscent of the real-world WikipediaNorth American Aerospace Defense Command|NORAD facility. Upon going back into the modern facility, they come across the Timeline of the Half-Life universe 15|1961 vitrification order from that side. After passing through a modern Emancipation Grill, they take a modern elevator bringing them back into the modern facility.
Upon leaving the elevator, the duo quickly reunites with Wheatley through his screens, and discover the newly built "boxes with legs", the Frankenturrets, starting the game's eighth chapter, ''Portal 2 storyline Itch|The Itch''.
====Gallery====
{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Screenshots
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FileSphere 6 and Sphere 7 Test Shaft 09 Portal 2.jpg|Sphere 06 and 07 above each other in the Shaft, as seen by noclipping.
FileSphere 7 under Main Platform Test Shaft 09 Portal 2.jpg|The unvisited Sphere 07 under the main platform.
FileMain Platform Test Shaft 09 Portal 2.jpg|Mobility Gel pipes and Gel Pump Station direction on the main platform.
FileArea_between_Sphere_7_and_Gas_Pump_Station_Test_Shaft_09_Portal_2.jpg|Overall view of the structure above Sphere 07.
FileSphere 7 Test Shaft 09 Portal 2.jpg|View of Sphere 07 from the other side of the platform.
FileMain Platform 2 Test Shaft 09 Portal 2.jpg|Outside the Mobility Gel chamber, as seen from the main platform.
FileLeaking Conversion Gel Pipe Test Shaft 09 Portal 2.jpg|Leaking Conversion Gel pipe.
FileLeaking Propulsion Gel Pipe Test Shaft 09 Portal 2.jpg|Leaking Propulsion Gel pipe.
FileMobility Gel Chamber Test Shaft 09 Portal 2.jpg|Overall view of the Mobility Gel chamber, with the Gels placed properly by Chell with her portals.
FileShaft leading to Gel Pump Station Test Shaft 09 Portal 2.jpg|The shaft leading to the Gel Pump Station.
FileShaft to Gel Pump Station Test Shaft 09 Portal 2.jpg|Ditto, after being covered with Conversion Gel.
FileUpper Shaft 2 Test Shaft 09 Portal 2.jpg|Upper into the shaft.
FileUpper_Shaft_Test_Shaft_09_Portal_2.jpg|Ditto, after being covered with Conversion Gel.
FileEnd of Shaft 2Test Shaft 09 Portal 2.jpg|Near the end of the shaft.
FileEnd of Shaft Test Shaft 09 Portal 2.jpg|The end of the shaft, covered with Conversion Gel.
FileTransition Seal 2 Test Shaft 09 Portal 2.jpg|Low-angle shot of Transition Seal 02 in Gel Pump Station's ceiling.
FileControl Booth Test Shaft 09 Portal 2.jpg|The control booth.
FileInside Control Booth Test Shaft 09 Portal 2.jpg|Inside the control booth, with the "paradoxes" poster on the left.
FileOutside Station Test Shaft 09 Portal 2 .jpg|View of the station from outside, after opening Transition Seal 02.
FilePlatform Test Shaft 09 Portal 2.jpg|The platform being lowered into the station.
FileModern Facility Test Shaft 09 Portal 2.jpg|Arrived under the modern facility, right above Gel Pump Station.
FileSprings 2 Test Shaft 09 Portal 2.jpg|View of the springs supporting the facility above.
FileSprings Test Shaft 09 Portal 2.jpg|Ditto.
FileModule Test Shaft 09 Portal 2.jpg|One of the many facility's modules resting on springs.
FileModern Fizzler Test Shaft 09 Portal 2.jpg|Modern fizzler met when entering the modern facility.
FileNotices in Corridor Test Shatf 09 Portal 2.jpg|The "cosmic ray spallation elements" and vitrification order notices in the corridor that follows.
FileModern Elevator Test Shaft 09 Portal 2.jpg|The modern elevator that brings back Chell and PotatOS to Wheatley.
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{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Logos, signs and posters
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FilePump station full.png|Direction stencil to the main Gel Pump Station, located above the platform above Sphere 07.
FileThis way up.png|Sign found inside the shaft leading to the station.
FileSloped surface.png|"Sloped surface" attention sign found inside the shaft leading to the station.
FileTransition Seal 02 sp.png|"Transition Seal 02" stencil found on the wall left of the main pipes. The FileTransition Seal 02 mp.png|full version is used for the Co-op Test Shaft.
FileConsole sign override.png|"Hatch Override" notice found near the hatch button in the control booth.
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==Behind the scenes==
FileA labs lauradubuk.jpg|200px|right|left|thumb|Concept art for ''F-STOP'', titled ''Aperture Laboratories''. It was one of the initial sketches aimed at exploring what Aperture Science might have looked like at the height of its time in the 1940s. The image is a play between Aperture's grand ideas about science and the anticipation that people might have had about its potential.http//store.valvesoftware.com/product.php?i=P2233 Aperture Laboratories lithograph at The Valve Store
''Since the article is very long, many BTS facts have been placed near their related subjects for better reading.''
*The Enrichment Shafts are what remains of the canceled game ''F-STOP'', which originally was to be a prequel to ''Portal 2'' set during Cave Johnson's era, hence the old-fashioned design of the area. It was not to feature Teleportation|portals, and Johnson was to be a protagonist later turning antagonist, a role adapted for Wheatley in the final game.''The Final Hours of Portal 2''
*As a relic of ''F-STOP'', the Test Shaft 09 chapters serve as a "timeline" level, visually telling the backstory of Aperture Science with signs, props, materials and many dates relayed through Johnson's messages and the area's visuals. According to Laura Dubuk, the 50s area was made to show that Aperture was very brisk at that time, with warm colors and high-quality quality; Cave Johnson and his staff were just starting out in their enterprise and everyone was eager to do science. This contrasts with the stark, cavernous environment outside and the materials seen in the 70s and 80s, where the materials become cheaper, with an abundance of plastic and linoleum showing that Aperture had fallen on harder times and could no longer build high-quality offices for its workers. Furthermore, many of the new dates and events pertaining to Aperture's history revealed in the chapters significantly Half-Life WikiRetcons|alter the original Aperture timeline revealed prior ''Portal 2''’s release on ApertureScience.com.
*FilePortal2 2011-05-27 22-45-54-79.jpg|View of the lake at the bottom of Test Shaft 09, with the elevator shaft on the right.|200px|left|thumbAccording to http//www.mobygames.com/developer/sheet/view/developerId,146597/ Chris Chin, the first map set in the actual Shaft marks a total reset to the aesthetics and scale of the environments up to this point in the game and was designed to give the player a sense of the vastness of Aperture before GLaDOS and a visual sense of the daunting climb they will have to make to get back to Wheatley, with they player's eye always tending to be drawn upwards. The open areas also encourage the player to explore their surroundings and take a break from the intensive puzzle solving of the Test Chambers. According to http//www.mobygames.com/developer/sheet/view/developerId,12182/ Tim Larkin, the overall Test Shaft 09 area also has a distinct personality compared to the modern facility. The doors, floors and buttons, soundscapes, as well as the sounds of decaying metal and wood, reflect the aging, outdated feel of the 50s, 70s and 80s periods, in contrast of the soundscape atmosphere of the unstable and self-destructing facility controlled by Wheatley that follows.
*Test Shaft 09 also introduces several striking elements in the ''Portal'' story arc
*FilePotatos.jpg|PotatOS.|200px|thumb|right"PotatOS", the potato-powered GLaDOS. According to Jay Pinkerton, the concept was one of the hardest writing jobs in the game.
*The Mobility Gels, reused from an old NPC ("Source Particle Benchmark|npc_surface") and the paint created for the student game ''Tag The Power of Paint'', much like the Teleportation|portal concept was reused from ''Narbacular Drop'', with several changes applied to their properties (and the Sticking Gel|sticking paint removed, while creating the Conversion Gel), as well as replacing the paint gun, and have the ASHPD redirect the Gels with its portals instead, as said by http//www.mobygames.com/developer/sheet/view/developerId,358070/ Ted Rivera.
*Caroline, Cave Johnson's assistant whose personality was transferred into GLaDOS. Her role originally was envisioned as a put-upon scientist named Greg, but the team considered wasteful to hire an actor for just one or two lines, hence reusing GLaDOS' voice actress Ellen McLain, which allowed the team to elaborate on GLaDOS' backstory.
*File80s offices.jpg|200px|thumb|left|Concept art for 80s offices.According to http//www.mobygames.com/developer/sheet/view/developerId,292108/ Adam Foster, the team explored their way through vast quantities of reference material while making ''Portal 2''. Inspirations included photos of WikipediaNASA|NASA's WikipediaApollo program|Apollo and WikipediaSpace Shuttle program|Shuttle programs, WikipediaCERN|CERN's particle accelerators (both modern and obsolete), industrial robots, derelict Soviet space shuttles, overgrown temples, WikipediaBrussels Metro|Brussels metro stations (which was built in the 70s, hence the striking 70s design), seedy American motels, junkyards filled with rocketry equipment, Chinese apartment blocks under construction, Polish shipyards, neutrino detectors deep underground in nickel mines, corporate headquarters from a variety of eras, commercial nuclear reactors, experimental fusion reactors, rain-sodden book depositories in Detroit, peculiar cameras, forgotten space probes, etc. This is well rendered in the Enrichment Shafts, frozen in several points of time.
*The last sign seen during Chell and PotatOS' fall to Test Shaft 09 indicates 4375 m; as seen when Chell wakes up, the very bottom is lower than that. However, when adding up the different heights featured in Test Shaft 09, a total of ~3660 m only is found; thus one of the two depths is incorrect. (This is deduced thanks to the depth numbers seen in the Main Lift shaft the depth seen on top of the 6th sphere is 2975 m, a sphere is ~87 m in height, the first sphere has around a sphere's height under it, there is ~50 m between the 50s and 70s spheres, and ~25 m between the 70s and 80s ones)
*The game files reveal Enrichment Shafts logos, signs and posters|several logos, signs and posters not appearing in-game, as well as codenames to be used for each sphere, each time starting with a WikipediaNATO phonetic alphabet|NATO phonetic alphabet code word. The names are, in sphere order (given by the texture file names "underground sphere 00#") "Whiskey-Hubble", "Bravo Volta", "Oscar Darwin", "Tango Franklin", "Juliet Planck", "Hotel Kepler", and "November Brahe". "Zulu Bunsen" also works the same way, as "Zulu" is the code word for "Z". The cut signs however were not necessarily to all appear in Test Shaft 09, as they are remains of ''F-STOP'', which would feature differences unknown so far.
*FileUnderground concept hatch.jpg|Concept art for the Abandonment Hatch, showing 4 buttons.|200px|thumb|rightAccording to http//www.mobygames.com/developer/sheet/view/developerId,57047/ Scott Dalton, the size of the Abandonment Hatch was a happy accident. For the team, the connection between old Aperture and new Aperture had to be a big set piece. The first model built was about five times bigger than the team expected, but they started to like it. They joked that it should be a bullet point on the ''Portal 2'' box "''Features the biggest door in games ever!''". They then decided it would be fun to play with the player's expectations and put a puny looking door behind it, along with a few small props. Furthermore, the Hatch was at some point to be opened with four buttons, reduced to two in the final game, as seen in concept art.
*While the Tartaros-themed ''Portal 2'' menu clearly shows burning in the fires Sentry Turrets with their eye turned on, in-game they are barely recognizable, with not even their eye visible. The burning debris could also consist of discarded High Energy Pellet emittors, as their larger size and less tightly curving shape might suggest.
*Several sounds of Caroline dialogue can be found in the game files, notably some involving her seemingly being forced into becoming GLaDOS by what may be Cave. It is unknown where they were to be heard.
===Gallery===
{|class="collapsible collapsed" style="margin0 auto;padding0 auto; font-size 14px" width=100% align=center id=toc
!class="article-template" align=center bgcolor= colspan=3|''Misc
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FilePortal 2 Concept Art Test Shaft 09.jpg|Concept art of Chell on one of the small spheres found at the bottom of the shaft.
File50s welcome concept.jpg|Concept art for the 1950s Lobby, with an Aperture Science Innovators logo on the glass, not present there in the final game.
FileAperture logo 1940.png|Aperture Science Innovators logo featured on the glass in the previous image. While it is not present there in the final game, it can be found in the game files, as well as different color variants on posters or the early Weighted Companion Cube.
FileUnderground concept hanging sphere.jpg|Concept art of a Sphere hanging from the ceiling.
FileUnderground concept stairs.jpg|Concept art of Chell on ruined stairs.
FileUnderground concept.jpg|Concept art of Chell among ruins.
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==List of appearances==
*PotatoFoolsDay ARG|''PotatoFoolsDay'' ARG {{1st}}
*''Portal 2''
*''The Final Hours of Portal 2''
==References==
{{Reflist}}
{{Succession
|title=''Portal 2'' journey
|before=Central AI Chamber (3)
|after=Wheatley's Testing Track
}}
{{Locations}}
{{Aperture}}
CategoryAperture Science locationsCategoryLocationsCategoryPortal 2CategoryEnrichment Shafts
{{PromoBox}}
