{{Article|hl2}}
{{Cleanup}}
{{Location Infobox
|image=FileCitadel from Canals.jpg|250px
|name=The Citadel
|hidei=
|constructed=After the Seven Hour War
|destroyed=During the Uprising
|location=City 17
|builder=Combine
|hidep=
|hideu=
|era=The Uprising
|affiliation=Combine
|maps=*background07
*d3_citadel_01 to d3_citadel_05
*d3_breen_01 (''Half-Life 2'')
*ep1_background01
*ep1_citadel_00 to ep1_citadel_04 (''Episode One'')
|designer=*Viktor Antonov (concept art)''Half-Life 2 Raising the Bar''
*http//www.mobygames.com/developer/sheet/view/developerId,56491/ Jeff Ballinger (concept art)
*Dhabih Eng (concept art)
*Eric Kirchmer (concept art)
*Jeremy Bennett (concept art)
*Randy Lundeen (mapping)WC mappack
*Aaron Barber (mapping)WC mappack
*Marc Laidlaw (backstory)
}}
The '''Citadel''' was the headquarters from which the Combine govern the Earth. It housed the office of Earth Administrator Dr. Wallace Breen and was approximately 2.5 kilometers high.
==Overview==
FileCitadel down.jpg|200px|thumb|left|The Citadel before its destruction.
The Citadel was located in City 17, and resembled a massive, metallic skyscraper, rising several kilometers into the sky from ground level, and extending some distance underground as well. It was a triangular structure when viewed from above, and was crowned by a Dark Energy Reactor. Its associated portal was the primary means of communication with off-world Combine forces. This super portal was probably how the Citadel came to Earth. The surrounding areas are blasted away, as if the whole structure fell out of the sky. The Citadel is heavily mechanized, and entire sections of it can move to allow for mass deployment of airborne Combine units such as City Scanners or Hunter-Choppers.
The Citadel had two known "states," or configurations that the tower takes depending on specific situations. The first of these is what was most likely the dormant configuration, which was probably maintained during the majority of life in the city, when no serious threats were posed to the Combine (the structure also takes this shape during ''Half-Life 2 Episode One''). This configuration was signified by a single set of rib-like structures exposed within the right half of the Citadel, with an outer metal plating retracted slightly above the inner plating. However, shortly after Gordon Freeman was transported inside Wallace Breen|Doctor Breen's office in the Citadel during the malfunctioning of Doctor Isaac Kleiner|Dr. Kleiner's teleporter, Breen puts the Citadel on alert, causing the structure to change to its alerted state. The Citadel can be seen changing its configuration while Barney Calhoun gives Gordon a crowbar. Barney says that this is a rare occasion, stating "I've never seen it lit up like that." The inner plating retracts upwards, exposing a total of four sets of "ribs", at the start of ''Route Kanal'', where the reconfiguration has fully completed. During this transformation a loud alarm resonates, echoing for several seconds each time it sounds, possibly emanating from the Citadel itself. A small piece of plating barely visible on the left (southern) side of the Citadel also descends partly down the tower, scanners and other ships rapidly deploy from around that area on the tower, and the Citadel remains in this configuration for the remainder of the game. The Citadel can also be seen from the rear near the first gate and "Water Hazard", showing a dull pair of metal strips separated by one vertical white beam. When Freeman sabotages the reactor, the plating descends to the "all clear" state and covers the ribs. The lower set of ribs descends along the tower and locks in place behind the lowest panel on the right hand side of the structure. It can be theorized that there are other configurations the Citadel may take in different situations, but these two are the only configurations depicted in the game.
As mentioned in the ''Raising the Bar'' book, entire blocks from City 17 vanished into thin air as the Combine delivered the Citadel to Earth. There is a slight mention of this event in Dr. Breen's first speech in ''Half-Life 2'', during which he states that the Citadel was "thoughtfully provided by Our Benefactors." The Citadel is embedded in a huge chasm with antiquated aqueducts and newer sewer pipes with broken ends extending in from the walls of the pit and cars, now scrap metal, lying at the bottom of the pit making it seem as if the Citadel plummeted into the ground forcefully from a high distance, and is completely surrounded by enormous mobile walls which chew up material around the Citadel and prevent access from the streets. Attached to the base of the Citadel are other machines that pound the ground. These are theorized to be used for destroying the city, acting as giant Restrictors to repel Antlions (supported by the antlions that invaded the city after the Citadel's deactivation in ''Half-Life 2 Episode One''), and/or gathering raw materials from the city's structures, but their true purpose remains unknown. It should be noted that the number of Citadels on Earth remains unknown in game. It also is clearly visible that there are numerous other Citadels on other worlds, as seen through an off-world portal which Dr. Breen intends to enter during the final moments of ''Half-Life 2''.
===Lower levels===
FileDark Fusion Reactor 1.jpg|200px|right|thumb|The Citadel's Core, exceedingly close to collapse.
In the first few chapters of ''Half-Life 2 Episode One'', the player is given a firsthand look at much of the lower levels of the Citadel. Whilst mostly looking very much the same as the rest of the Citadel, no war factories or synth manufacturing plants are located in this area of the structure. During this point in the game the Citadel can be seen as extremely unstable, with an orange glow sweeping through the structure in contrast to the blue it used to be when functional. Fires have spread across the structure and much debris from what's left of the upper levels is constantly falling down to the lower levels.
An emergency evacuation chamber is located in the lower levels of the Citadel. The room is significantly different from that of the rest of the Citadel, giving off an eerie red glow from hundreds of bright lights mounted on the walls in contrast to the blue and orange that characterizes the Citadel at the time. The room seems to serve as an emergency evacuation chamber, allowing Combine Advisors to quickly escape in times where the Citadel is in peril. The Advisor Pods are located under the glass floor of the room and when preparing to dock they rise up and move through a tube before positioning themselves in a chute and moving upwards.
Toward the very bottom of the Citadel is its core which is only accessible via a lift that descends several dozen floors. The core chamber is protected by large blast doors carrying an insignia with the appearance of a stylized version of the international symbol for radioactivity. A large control room is situated overlooking the core with a central access lift leading down to its chamber, similar in design to the control room overlooking the Dark Fusion reactor at the opposite end of the structure. Three rooms are located across the chamber which are specifically designed to help stabilize the core in the event that its energy output becomes unstable. The machines in these rooms form a threefold containment system that ensures that the intensity of the dark energy reaction within the core stays within safe limits. Connected onto the core itself is a train station where it is likely that Razor Train cargo is emptied. This point in the Citadel lies approximately one kilometer below the surface and extends throughout City 17 and beyond.
===Central levels===
FileRazor train.jpg|200px|left|thumb|Razor Train seen inside the Citadel.
In the final chapters of ''Half-Life 2'', the player is given an insight into the interior of the Citadel, which contrasts its featureless exterior. Abundances of Combine technology are found within the Citadel, ranging from countless generators and force fields, to matter disintegration fields, to elevators and platforms that defy gravity, to giant tubes that transport unknown fluids. The architecture of the Combine has its greatest presence in the Citadel. The entire building is constructed from the same blackish blue metal which all Combine structures are made from. No attempt is made at all to provide personnel with any form of warmth or soft aesthetic. Everything is sharp, cold, and unfeeling, mirroring that of the Combine's rule. No regard is placed at all to the covering of the piping and electronics. The metal is unfinished and oxidizing. The human features that are present however, such as walkways, stairs and ladders, seem to just be an afterthought, as if the usability for humans was not a firsthand priority.
All "visitors" routinely have weapons stripped using a confiscation field, presumably to avoid precisely the situation which occurs at the end of ''Half-Life 2'' and reoccurs at the beginning of ''Episode One'' ironically, ''because'' of the presence of a confiscation field. It is also possible that some related technology extends throughout the Citadel, as any weapons dropped on the ground disintegrate in the same manner as in the confiscation field. This is not a by product of Energy Balls or the Gravity Gun, as those weapons dropped by soldiers killed by Alyx Vance also disintegrate.
However, activating the "Gravity_Gun Gravity Gun" feature with a console commands also causes all weaponry dropped by an NPC to be vaporized when dropped, which shows that it is more the status of weaponry than the actual map that dictates weapon suppression.
There are railway systems running throughout the Citadel that are used by Razor Trains to ship and deliver cargo. Much of this cargo consists of new Stalkers from Nova Prospekt. Stalkers are delivered in pods, and the Citadel includes a large transportation system for these pods. Tasks such as the operation of basic panels, or the repairing of damaged Combine equipment and units is done by Stalkers, under the constant supervision of Overwatch personnel or City Scanner|scanners.
The Citadel is presumed to include large war factories, where Combine equipment, technology and weapons, as well as Synths are manufactured. Two types of Synth that were never encountered elsewhere during the game, the Crab Synth and the Mortar Synth, can be seen being transported around on conveyor belts, indicating that they are possibly manufactured in the Citadel, although this could only be a means of moving the Synths throughout the large facility. The Citadel also provides a central hub for Overwatch soldiers (including Elites), who are present in overwhelming numbers, and is the launching point for Combine Gunship|Gunships.
===Upper levels===
FileHalf-Life 2 Dr Breen Office.jpg|200px|right|thumb|The interior of Doctor Breen's office at an upper level of the Citadel, as Gordon Freeman is transferred in.
Before reaching the very top of the citadel, Freeman passes through many open areas of the citadel where enormous segments of the citadel exterior wall open and close to allow Dropships and gunships to quickly exit and enter the citadel's interior.
On one of the very top levels of the Citadel is Doctor Breen's office, believed to be the location from which he transmits his Breencasts-though the walls do not match his "studio" backdrop, suggesting there is a separate room for that purpose. Unlike the rest of the Citadel, Breen's office has a more classical, human look to it, although Combine architecture is still a very dominating, albeit aesthetic, feature in the room. His office includes various luxury items such as a wooden desk, mantle clock, leather seat, globe, expensive carpeting, tiled floors, and busts of himself, much like the generator rooms in the Overwatch nexus. His office also contains a large set of monitors, which act as his personal computer, and from which he can communicate with contacts such as the Combine Advisor. Breen's office is connected to the prisoner transport system used by Gordon Freeman, and there are many other prisoner pods around his office. Otherwise, more welcome guests can access the office via an elevator connected to the dark fusion reactor or a separate door from the prisoner entrance. It can be assumed that Breen lives in the Citadel as well as works in it.
The very top of the Citadel contains the Combine's dark fusion reactor-that seems to be directly connected to Breen's office, which is used to power their tunneling entanglement device and allow them to tunnel into Earth from their universe. At the end of ''Half-Life 2'', Gordon manages to destabilize and destroy the dark fusion reactor using Energy Balls.
==Destruction==
FileEpisode1 Last Chapter.jpg|200px|thumb|left|The Citadel shortly before its destruction in ''Episode One''.
FileCity 17 destroyed Citadel forest view.jpg|thumb|The destroyed Citadel.
In ''Episode One'', the aftermath of Gordon's assault on the Citadel is clearly visible. The overloading of the Dark Fusion reactor has downed power and destabilized the structure of the whole building, and Gordon must make his way to the core to re-engage the containment field and delay the core's inevitable meltdown. The Citadel is by this time barely occupied compared to its earlier state, presumably most of the soldiers and synths have been evacuated into City 17 to prevent the Citizens from escaping the blast. There are however, several soldiers left, and a few Stalkers for operating machinery. The Citadel's interior now glows orange, in stark contrast to the cold blue it used to be when functional, while bridges are falling apart and debris continuously falls from the top of the tower. From the outside, the Citadel's peak is surrounded by swirling black and red clouds with green lightning bolts emerging. The power lines connecting the Citadel to City 17 are no longer present, and the explosion of the Dark Fusion reactor has blown the top of the Citadel off. The climax of ''Episode One'' is witnessed by Gordon and Alyx, when the Citadel's core suffers the inevitable meltdown as it collects the colossal amount of energy needed to send a final data transmission off-world to the rest of the Combine empire. Dr. Kleiner notes in one of his messages to the Resistance that the destruction of the City 17 Citadel has also caused the other Citadels across the planet to shut down.
In ''Half-Life 2 Episode Two'', the Citadel still dominates City 17 even in its ruin. A Superportal looms over the crater where the Citadel once stood, drawing power to open from the remnants of the dark fusion core through a swirling blue tendril of energy. At the end of Episode 2 the Citadel's collapsed remains are all that is left of the once tall and overpowering structure.
==Behind the scenes==
===Design evolution===
{{underconstruction}}
The Citadel went through various designs during the game's development, as seen in several concept art images and the WC mappack. It started as a http//developer.valvesoftware.com/wiki/Brush brush until becoming the model seen in ''Half-Life 2''.
====Organic version====
This version has organic roots. It is featured only in concept arts by Viktor Antonov and Dhabih Eng.
=====Gallery=====
FileCitadel star.jpg|The Citadel, with the Manhack Arcade on the bottom-left, based on Seattle's FileSeattle's Macys by Ww7021.jpg|Macy's.
FileCitadel windows.jpg|Concept of the Citadel's interior.
FileTrain city 17.jpg|City 17's train concept, with a prototype City logo on the train and the Citadel in the distance.
FileGordon early lower citadel.jpg|Gordon arriving at the Citadel's lower entrance. This concept was reused for the top of the Citadel in the next version.
====Poster version====
This version is featured in the map "c17_04_21.vmf", last edited December 2002. It is entirely brown and apparently not detailed, while a closer look shows it is detailed,WC mappack featuring a circle, windows, and other precise shapes.
Its inside maps have concrete and rusty metal walls, sometimes with floor numbers on the walls, and were all last edited in 2001. One of these inside maps, "proto_core002.vmf", shows the Citadel Core was originally to appear in ''Half-Life 2''. Another map, "proto_C17citadel_skybox.vmf", features a detailed spire, which appears grey-colored, not brown,WC mappack and seems to be based on concept art for the previous version's lower entrance and predate the dark fusion reactor area featured at the end of ''Half-Life 2''.
This version is also featured in three Combine propaganda posters made by Randy Lundeen (who mapped the version|tiles version of the citadel) and based on artwork by Dhabih Eng. In its skybox can be found the "inner wall" mentioned by Alyx in the playable ''Half-Life 2'' Beta sound files, and where Vance Headquarters are located, as well as the radio tower located near the Manhack Arcade and Kleiner's Lab.WC mappack
FileCitadel poster.jpg
FilePaperposter004a.png
FileMetropolice guard early poster.jpg
FileConsul greater good poster.jpg
FileLogoarm.svg
FileDemo citadel02 garbage fixed0037.JPG
FileDemo citadel02 garbage fixed0038.JPG
FileDemo citadel02 garbage fixed0039.JPG
FileDemo citadel02 garbage fixed0040.JPG
FileProto core002 fixed0001.jpg
FileProto core002 fixed0005.jpg
FileProto core002 fixed0006.jpg
FileProto c17citadel skybox fixed004.jpg
FileProto c17citadel skybox fixed001.jpg
FileProto c17citadel skybox fixed005.jpg
FileProto c17inner01.jpg
====Tiles version====
*Designed by Viktor Antonov, this is the last known brush version. It appears as a long cylinder divided in several parts and with other shapes stuck around it, where rooms and corridors can be found. Covered by grey and brown in the outside, it is topped by some kind of huge antenna. It is featured in the maps "c17_04_41.vmf", "proto_citadel_002.vmf" (as a human-size version), "proto_citadel_skybox.vmf", among others, most of them last edited in 2001.WC mappack
*It is also the first version featuring inside maps. Some shapes are similar to the retail version, except all floors, walls and ceilings are entirely covered in tiles. Metallic pipes with organic forms can also be found all around, as well as a prototype prison area with Citizens and Vortigaunts in the cells, having concept art for the Depot based on them.WC mappack It should be noted that most of these maps are demos and prototypes and that they are very incomplete.
*The shaft seen in the Citadel in ''Episode One'' where the Advisor leaves was originally to be seen in ''Half-Life 2'' and is present as a prototype map ("proto_citadel_advisor.vmf") in that Citadel version.WC mappack
*Most of the WC mappack inside maps are located in that version and were made by Randy Lundeen, according to the folder name, "randy".WC mappack He also designed the cut version|propaganda posters featuring another Citadel version.
=====Gallery (outside)=====
FileCitadel brown.jpg
FileCitadel tiles night.jpg
FileProto citadel skybox fixed0017-2.JPG
FileProto citadel skybox fixed0015.JPG
FileProto citadel 002 fixed0013.JPG
FileProto citadel 002 fixed0014.JPG
FileConsulcast arcade.jpg
=====Gallery (inside)=====
FileConsul office.jpg
FileProto citadel consul fixed0021.jpg
FileProto citadel consul fixed0000.JPG
FileProto citadel consul fixed0009.JPG
FileProto citadel consul fixed0010.JPG
FileProto citadel consul fixed0011.JPG
FileProto citadel consul fixed0013.JPG
FileCitadel interior.jpg
FileProto citadel interior1 fixed0002.JPG
FileProto citadel interior1 fixed0004.JPG
FileProto citadel interior1 fixed0019.jpg
FileProto citadel interior1 fixed0029.JPG
FileProto citadel interior2 fixed0022.JPG
FileProto citadel interior2 fixed0023.JPG
FileProto citadel interior2 fixed0024.JPG
FileProto citadel interior3 fixed0000.JPG
FileProto citadel interior3 fixed0005.JPG
FileDemo citadelpipes fixed0000.JPG
FileProto citadel tankroom fixed0031.JPG
FileDemo citadel01 fixed0014.JPG
FileProto citadel mechanical fixed0015.JPG
FileProto citadel mechanical fixed0018.JPG
FileProto citadel advisors fixed alt0000.JPG
FileProto citadel advisors fixed alt0001.JPG
FileProto citadel advisors fixed alt0003.JPG
FileProto citadel advisors fixed alt0004.JPG
FileProto citadel advisors fixed alt005.JPG
FileProto citadel advisors fixed alt0011.JPG
FileDepot cell.jpg
FileDepot cellblock1.jpg
FileDepot cellblock2.jpg
FileDepot cellblock3.jpg
FileDemo citadel01 fixed0000.JPG
FileDemo citadel01 fixed0003.JPG
FileDemo citadel01 fixed0007.JPG
FileDemo citadel01 fixed0020.JPG
FileDemo citadel01 fixed0029.JPG
FileDemo citadel01 fixed0006.JPG
FileCombine techno move.jpg
====E3 Terminal version====
The version, the first model and designed by Eric Kirchmer, is a round and blueish version. It is featured in the latest version of the map "e3_terminal.vmf". It is also featured in "e3_strider.vmf" and "canals_01_11.vmf".WC mappackPlayable Half-Life 2 Beta|''Half-Life 2'' Beta files In an unmodified ''Half-Life 2'' Beta, the model appears greenish, however this was fixed by the community.
=====Gallery=====
FileCitadel skyscrapers view.jpg|Concept art, among American skyscrapers.
FileCitadelfar mdl.jpg|Model.
FileCitadel terminal.jpg|The Citadel as seen in a fixed version of the WC mappack map "e3_terminal.vmf", from the ''http//www.hl-beta.spb.ru/ Half-Life Beta Project''.
FileCitadel e3strider.jpg|The "e3_terminal.vmf" Citadel in the map "e3_strider.vmf".
FileCanals_01_110004.jpg|The "e3_terminal.vmf" Citadel seen behind the City 17 outer concrete wall, in the map "canals_01_11.vmf".
FileCitadel e3 terminal logo.svg|Standard Combine logo seen on that version.
===="Clamp" version====
This version looks like a giant blue-grey clamp, with Depot-like buildings at its feet. It was likely designed by Viktor Antonov. It can be found in the map "proto_docks.vmf", probably created when Freeman was still to reach City 17 with the ''Borealis (cut location)|Borealis'',http//www.gamespot.com/features/6112889/p-6.html "The Final Hours of Half-Life 2", Page 6 The Hemoglobin, on GameSpot "d1_sewer51j.vmf" and "proto_combine_underground5.vmf". The map "d1_under0102a.vmf" contains a version halfway between this one and the next.WC mappack
=====Gallery=====
FileProto docks fixed0006.jpg
FileCitadel sewer.jpg
FileCitadel clamp1.jpg
FileCitadel clamp4.jpg
FileCitadel clamp2.jpg
FileCitadel clamp3.jpg
====Pre retail version====
The penultimate version, designed by http//www.mobygames.com/developer/sheet/view/developerId,56491/ Jeff Ballinger and Viktor Antonov, was first created with the same Depot-like buildings at its feet like the previous version, with the original cylinder Citadel brush replaced by a triangular prism Citadel brush (and the texture unchanged), as seen in the map "d1_under0102a.vmf", "proto_innerwall" and in an early "e3_terminal" screenshot. The map "proto_combine_underground5.vmf" contains the same brush as in "d1_under0102a.vmf, but this time much bigger, and with a proper Depot model at its feet, used for the Depot seen along the Coast, and Combine mobile walls (this is a much more recent depiction).WC mappack Then a model (the second known one in total) was created; this is the one featured in the playable ''Half-Life 2'' Beta; it is almost identical to the next and latest version.Playable Half-Life 2 Beta|''Half-Life 2'' Beta
The next and last version, and the third model, is featured in ''Half-Life 2'', and covered Citadel 5|below. Almost identical to the previous version, that triangular prism is bluer and more detailed, and not a single Depot is found at its feet anymore.
=====Gallery=====
FileCitadel Ballinger.jpg
FileCitadel brush d1 under0102a.jpg
FileProto c17map 01.jpg
FileE3 Terminal plaza.jpg
FileCitadel wide.jpg
FileCitadel walls.jpg
FileCitadel c17 soldiers beta.jpg
FileProto innerwall randy fixed2.jpg
FileProto innerwall randy fixed1.jpg
FileGordonalyx2.jpg
FileCitadel inside.jpg
FileLate beta tracks.jpg|Early screenshot of the tracks behind the City 17 Train station, featuring the Citadel behind, removed from the final version.
===Trivia===
*Some designs were also taken from the ''Half-Life'' chapter ''Interloper'', especially in the dark fusion reactor.
*The current design is reminiscent of the CommonsFileZelenograd - Shtyki Memorial.JPG|Bayonets Memorial in Zelenograd, Russia, as well as a http//www.flickr.com/photos/avtost/989844774/ monument in Aberystwyth University in Wales.
*The Citadel was originally to feature a garbage incinerator, although it is not clear in what version of the Citadel it was to be located.WC mappack
*The final showdown dialogue between Breen, Mossman, Eli, and Alyx was originally to be much different and much longer.
==Gallery==
{{underconstruction}}
===''Half-Life 2''===
====Concept art====
FileAlyx headset.jpg
FileConsul2.jpg
FileGordon consul gunpoint.jpg
====Screenshots====
FileBackground plaza.jpg
FileD3 c17 070006.JPG
FileD1 trainstation 05000027.jpg
FileCitadel scanners.jpg
FileD1 trainstation 060003.jpg
FileCitadel menu background.jpg
FileCitadel View.jpg
FileRazor train.jpg
FileD3 citadel 02084.JPG
FileD3 citadel 020085.JPG
FileD3 citadel 010020.JPG
FileD3 citadel 010021.JPG
FileD3 citadel 010022.JPG
FileD3 citadel 010025.JPG
FileD3 citadel 020005.JPG
FileD3 citadel 020014.JPG
FileD3 citadel 020024.JPG
FileD3 citadel 010000.JPG
FileD3 citadel 010001.JPG
FileD3 citadel 010002.JPG
FileD3 citadel 010003.JPG
FileD3 citadel 020045.JPG
FileD3 citadel 020060.JPG
FileD3 citadel 020068.JPG
FileD3 citadel 020098.JPG
FileD3 citadel 030125.JPG
FileD3 citadel 030126.JPG
FileD3 citadel 030127.JPG
FileD3 citadel 030129.JPG
FileD3 citadel 030133.JPG
FileD3 citadel 030150.JPG
FileD3 citadel 030166.JPG
FileD3 citadel 030169.JPG
FileD3 citadel 030189.JPG
FileD3 citadel 030186.JPG
FileD3 citadel 040205.JPG
FileD3 citadel 040206.JPG
FileD3 citadel 040207.JPG
FileD3 citadel 040246.JPG
FileD3 citadel 040255.JPG
FileD3 citadel 040264.JPG
FileD3 citadel 040287.JPG
FileD3 citadel 040292.JPG
FileD3 citadel 050310.JPG
FileD3 citadel 050314.JPG
FileD3 citadel 050318.JPG
FileD3 citadel 050339.JPG
FileD3 citadel 050361.JPG
FileD3 citadel 050367.JPG
FileD3 citadel 050347.JPG
FileD3 breen 010000.jpg
FileBreen entrance.jpg
FileHalf-Life 2 Dr Breen Office.jpg
FileD3 breen 010017.JPG
FileD3 breen 010065.jpg
FileD3 breen 010024.JPG
FileD3 breen 010080.JPG
FileD3 breen 010081.JPG
FileD3 breen 010108.JPG
FileD3 breen 010118.JPG
FileD3 breen 010120.JPG
FileD3 breen 010123.JPG
FileD3 breen 010124.JPG
FileTrio citadel kiss.jpg
FileAdvisor screen.jpg
FileDarkfusionreactor.jpg
FileDarkfusionreactor2.jpg
FileD3 breen 010073.JPG
FileD3 breen 010098.JPG
FileD3 breen 010140.JPG
FileD3 breen 010005.JPG
FileD3 breen 010011.JPG
FileD3 breen 010045.JPG
FileD3 breen 010112.JPG
FileD3 breen 0100005.JPG
FileD3 breen 0100225.JPG
FileD3 breen 010067.JPG
FileD3 breen 010077.JPG
FileD3 breen 0100815.JPG
===''Half-Life 2 Episode One''===
====Screenshots====
FileAlyx vorts intervention.jpg
FileDog finds gordon.jpg
FileEp1 citadel 000022.jpg
FileEp1 citadel 000002.JPG
FileEp1 citadel 000038.JPG
FileEp1 citadel 000039.JPG
FileEp1 citadel 000042.JPG
FileHl2ep1 alyx+dog.jpg
FileAlyx watching decay.jpg
FileCitadel core drop.jpg
FileCitadelreactorcore.jpg
FileEp1 citadel 000087.JPG
FileReactormalfunction.jpg
FileEp1 citadel advisors room advisor screen.jpg
FileEp1 citadel advisors room breen record.jpg
FileEp1 citadel advisors room pods.jpg
FileCitadel Red Room.jpg
FileEp1 citadel advisors room.jpg
FileEp1 citadel advisors room advisor breen leaving1.jpg
FileEp1 citadel advisors room advisor breen leaving2.jpg
FileEp1 citadel alarm.jpg
FileEp1 citadel alyx stalkers.jpg
FileEp1 citadel bridge light.jpg
FileEp1 citadel bridge.jpg
FileEp1 citadel broken bridge.jpg
FileEp1 citadel ceiling.jpg
FileEp1 citadel core device.jpg
FileEp1 citadel corridor dark.jpg
FileEp1 citadel corridor logo.jpg
FileEp1 citadel 010024.JPG
FileEp1 citadel crashed dropship container.jpg
FileEp1 citadel elevator emitter.jpg
FileEp1 citadel energy bridge.jpg
FileEp1 citadel energy void.jpg
FileEp1 citadel generators.jpg
FileEp1 citadel junk alyx.jpg
FileEp1 citadel 000001.JPG
FileEp1 citadel mechanisms.jpg
FileEp1 citadel stairs.jpg
FileEp1 citadel 02b0041.JPG
FileEp1 citadel 010002.JPG
FileEp1 citadel 010006.JPG
FileEp1 citadel 020029.JPG
FileEp1 citadel 020030.JPG
FileEp1 citadel 020032.JPG
FileEp1 citadel 020036.JPG
FileEp1 citadel 020039.JPG
FileEp1 citadel 010015.JPG
FileNaked overwatch citadel ep1.jpg
FileMemory replacement Citadel2.jpg
FileEp1 citadel 030021.JPG
FileEp1 citadel 02b0043.JPG
FileEp1 citadel 030022.JPG
FileEp1 citadel 030024.JPG
FileEp1 citadel 030026.JPG
FileEp1 citadel 030028.JPG
FileForce field bridge.jpg
FileCitadel alyx elevator waiting.jpg
FileRollermine duel.jpg
FileEp1 citadel station.jpg
FileEp1 citadel station2.jpg
FileStrider rubble C17.jpg
FileAlyx City 17 Citadel meltdown.jpg
FileEp1 c17 050027.JPG
FileEp1 c17 06001299.jpg
FileEp1 c17 060020.jpg
FileEp1 c17 06003099.jpg
FileEp1 c17 060030.jpg
FileEp1 c17 060033.jpg
===''Half-Life 2 Episode Two''===
====Concept art====
FileCity 17 destroyed Citadel forest view.jpg
FileCity17 destroyed.jpg
FileCitadel concept.jpg
FileOutlands Citadel concept.jpg
FileCity17 concept ep2.jpg
====Screenshots====
FileCitadel smoke trailer.jpg|The destroyed Citadel in the second ''Episode Two'' teaser.
FileSuperportal.jpg
FileEp2 outland 010003.JPG
FileHL2EP2PortalStorm.jpg
FileEp2 outland 010011.jpg
FileEp2 outland 010023.JPG
==List of appearances==
*''Half-Life 2'' {{1st}}
*''Half-Life 2 Raising the Bar''
*''Half-Life 2 Deathmatch'' {{Nc}}
*''Half-Life 2 Episode One''
*Source Particle Benchmark {{Gf}} {{Nc}}
*''Half-Life 2 Episode Two''
*''The Final Hours of Portal 2''
==References==
{{Reflist}}
==See also==
*Half-Life 2 original storyline
{{succession
|title=''Half-Life 2'' story arc journey
|before=Overwatch Nexus
|after=Citadel Core
}}
{{succession
|title=Half-Life 2 original storyline|''Half-Life 2'' original storyline
|before=Vance Headquarters
|after=N/A
}}
{{Locations}}
{{Technology}}
{{Combine}}
CategoryCombine technologyCategoryCity 17 locationsCategoryCombine locationsCategoryLocationsCategoryViktor Antonov designsCategoryDhabih Eng designsCategoryJeremy Bennett designs
{{Article|Image}}
{{Information
|attention=
|description=Advisor Pods fleeing from the dying Citadel as Gordon and Alyx watch them from the leaving train.
|source=''Half-Life 2 Episode One''
|author=
|filespecs=
|licensing={{Gamescreenshot}}
|other versions=
|cat artist=
|cat subject=CategoryCitadel imagesCategoryAdvisor Pod images
|cat type=CategoryHalf-Life 2 Episode One screenshots
}}
