{{Location Infobox
|image=FileCitadel from Canals.jpg|250px
|name=The Citadel
|constructed=After the Seven Hour War
|destroyed=During the uprising
|location=City 17
|era=Combine occupation of Earth|Combine occupation
*d3_citadel_01 to
d3_citadel_05 *d3_breen_01 (''Half-Life 2'') *ep1_background01 *ep1_citadel_00 to
(''Episode One'') |designer=*Viktor Antonov (concept art)''Half-Life 2 Raising the Bar'' *Jeff Ballinger (concept art) *Dhabih Eng (concept art) *Eric Kirchmer (concept art) *Jeremy Bennett (concept art) *Randy Lundeen (level design)WC mappack''Half-Life 2 Episode One'' commentary *Aaron Barber (level design)WC mappack *Danika Wright (main model and interiors design)http// Danika Wright's resume *Marc Laidlaw (backstory) }} {{Quote|There was an illusion of safety, for a time. And then the Citadels appeared. It happened in a split second, all over the world. A chunk would disappear from the center of a city, to be replaced an instant later by one of these... headquarters for the Combine. Invasion Central.|Eli Maxwell|Half-Life 2 Raising the Bar}} The City 17 '''Citadel''' is one of the numerous Combine Citadels scattered around Earth,Kleiner's speech during ''Episode One'' and the most important. It houses the office of Earth Administrator Dr. Wallace Breen. ==Overview== FileCitadel down.jpg|200px|thumb|left|The Citadel before its destruction. The Citadel was the headquarters from which the Combine govern the Earth. It was located in City 17, and resembled a massive, metallic skyscraper, rising approximately 2.6 kilometers into the sky from ground level,http// Half-Life 2 Citadel Heighthttp// An e-mail to Marc Laidlaw about the Citadel's height and extending some distance underground as well. It is a triangular structure when viewed from above, and is crowned by a Dark Energy Reactor. Its associated portal is the primary means of communication with offworld Combine forces. The Citadel likely came to Earth via a Superportal. 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 is most likely the dormant configuration, which is probably maintained during the majority of life in the city, when no serious threats are posed to the Combine (the structure also takes this shape during ''Half-Life 2 Episode One''). This configuration is 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 the player is transported inside Wallace Breen|Doctor Breen's office in the Citadel during the malfunctioning of Doctor Isaac Kleiner|Dr. Kleiner's teleport, 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 Thumpers 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 in Earth remains unknown in game. It also is clearly visible that there are numerous other Citadels outside Earth, 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. Every thing 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 Energy Field Manipulator|Dark 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, as most of the soldiers and synths have presumably 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. ==Related Achievements== {|class=wikitable style="vertical-aligncenter;" width=50% |- !colspan="2" style="text-alignleft"|''The Orange Box Achievements 2|Half-Life 2'' |- |rowspan=2 width=64px|FileHl2 disintegrate soldiersinfield.png !style="text-alignleft"|Atomizer (10G) |- |''Disintegrate 15 soldiers by throwing them into a Combine ball field.'' |- |rowspan=2 width=64px|FileHl2 beat game.png !style="text-alignleft"|Singularity Collapse (25G) |- |''Destroy the Citadel's reactor core.'' |- !colspan="2" style="text-alignleft"|''The Orange Box Achievements 2 Episode One|Half-Life 2 Episode One'' |- |rowspan=2 width=64px|FileWatch Your Head!.jpg !style="text-alignleft"|Watch Your Head! (5G) |- |''Make it to the bottom of the Citadel's main elevator shaft in one piece.'' |- |rowspan=2 width=64px|FileContainment.jpg !style="text-alignleft"|Containment (5G) |- |''Contain the Citadel Core.'' |- |rowspan=2 width=64px|FilePacifist.jpg !style="text-alignleft"|Pacifist (10G) |- |''Contain the Citadel Core without killing any Stalkers.'' |- |} ==Behind the scenes== ===Design evolution=== {{Underconstruction-inline}} 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// 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. The map "proto_C17inner.vmf" shows the immediate area surrounding the citadel behind the "inner wall" mentioned by Alyx in the ''Half-Life 2'' leak sound files, and where Vance Headquarters are located,WC mappack featuring brown concrete building-like structures, with rows of small windows in them and sometimes connected with bridges, and deep holes in the ground, some with bright green light shining out of them. The aforementioned structures appear to be forcefully built or cut into a previously existing city block. The inside maps of this version 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''. The spire is surrounded by the same brown concrete building-like structures and has large pipes leading down from the surface at its foot. 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. 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" (featuring Combine buildings connected to it at its base), 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, mostly being small showcase rooms. *This version of the citadel also appears to be more industrialized, featuring mechanisms such as pistons and rotating valves (as seen in the maps demo_camshaft, featuring a brush piston mechanism similar to the stenographer's chasm, and proto_citadel_mechanical, all in the randy folder). The purpose of these mechanisms is unknown. *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 was first seen in the https// ''Half-Life 2'' E3 2002 Trailer. 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 mappackDevelopment of Half-Life 2 game|''Half-Life 2'' leak files In an unmodified ''Half-Life 2'' leak, 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// 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", "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 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 ''Half-Life 2'' leak; it is almost identical to the next and latest version.Development of Half-Life 2 game|''Half-Life 2'' leak 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 early.jpg FileProto innerwall randy fixed2.jpg FileProto innerwall randy fixed1.jpg FileGordonalyx2.jpg FileCitadel inside.jpg FileLate early tracks.jpg|Early screenshot of the tracks behind the City 17 Trainstation, featuring the Citadel behind, removed from the final version. ===Miscellaneous=== *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// 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-inline}} ===''Half-Life 2''=== ====Concept art==== FileAlyx headset.jpg FileConsul2.jpg FileGordon consul gunpoint.jpg ====Screenshots==== FileCitadel simple.jpg|Original Maya model. FileBackground plaza.jpg FileD3 c17 070006.JPG FileD1 trainstation 05000027.jpg|Breen in his office in the Citadel, recognizing Gordon Freeman during his teleportation mishap. FileBreen desk.jpg|Breen's office as featured in the teleportation mishap. 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 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 010010.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 FileD3 breen 010048.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 FileD3 breen 010093.JPG|The dark fusion reactor exploding. FileD3 breen 0100925.JPG|The G-Man freezing time after the reactor explodes. FileD3 breen 010102.JPG|The G-Man's monologue about the latest events. ===''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 FileEp1 citadel 030004.JPG FileEp1 citadel 030005.JPG FileEp1 citadel 030008.JPG FileEp1 citadel 030018.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== *https// ''Half-Life 2'' - E3 2002 Trailer {{1st}} {{Nc}} *''Half-Life 2'' *''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'' ==See also== *Half-Life 2 original storyline|''Half-Life 2'' original storyline ==References== {{Reflist}} {{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 technology CategoryTechnology CategoryCity 17 locations CategoryCombine locations CategoryLocations CategoryViktor Antonov designs CategoryDhabih Eng designs CategoryJeremy Bennett designs