New Paper Craft: Half Life 2 - Citadel Free Building Paper Model Download

This building paper model is the Citadel, the headquarters from which the Combine govern the Earth, based on the Half Life 2 science fiction video game, the paper model was created by Melvin Melnick.

The Citadel housed the office of Earth Administrator Dr. Wallace Breen and was approximately 2.5 kilometers high. 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 Doctor Breen's office in the Citadel during the malfunctioning of 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 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, 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. More infomation at Wikia.

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