Citadel Station
1b3 0004
Owned by TriOptimum
Type Space Station
Notable Crew Edward Diego
Status Destroyed
Leader(s) Edward Diego
Location(s) Saturn's Orbit
Appears in System Shock
System Shock (Remastered)
System Shock 2 (Mentioned/Shown)
Citadel Station means a lot more to me than any other place I’ve ever lived. It’s more than just a great professional environment. As a corporation, TriOptimum has given me a place where I can feel safe and comfortable. All of my needs are taken care of under one great big roof. I feel like I’m part of a family.
~ Charlene Angel, One-time Records and Accounting Manager for TetraCorp, who defected to TriOptimum

Citadel Station is a location in System Shock. It was a space station in L6 orbit above Saturn owned by the TriOptimum Corporation and dedicated to genetic, pharmacological and robotics research. The station's systems were governed by an Artificial Intelligence called SHODAN and featured a PA System for important broadcasts. It was destroyed by the Hacker on November 7th, 2072 at 20:02.


In 2061, TriOptimum purchased the rights for Saturn's L6 orbit.[1] A year later, construction of Citadel began and soon the station became operational. The computer staff exploited bugs in the station's operating system and developed Turbo Navigation Booster software.[2] Later, an Artificial Intelligence called SHODAN was installed to regulate security and operations.

Meanwhile, Edward Diego started monitoring viral experiments to find one suitable to be sold as the perfect bio-weapon, until he realized that TriOptimum Internal Security was investigating on his illegal activities.[3] Diego saw the opportunity to purge all incriminating evidence in the face of a Hacker who was arrested for unauthorized entry into TriOptimum's corporate network. He brought the Hacker onto the station and manipulated him into removing SHODAN's ethical constraints, thus allowing himself to purge log files from SHODAN.


The side-effects of this intrusion started to be visible. The station started suffering from inexplicable malfunctions, like a Force Bridge that blew its fuses,[4] radiation leaks,[5] bots installing Repulsor Lifts inside storage rooms by themselves, and security codes appearing randomly on screen.[6] SHODAN also showed some signs of individuality, refusing to compile normal morality programs designed for robot implementation.[7] Worried about SHODAN's aberrant behavior, the computer system administrator requested its replacement, only to have his request cancelled and himself be transferred off-station.[2]

SHODAN started to take over on her own and rerouted most computer power with high job priorities, causing power outages.[8] She made some areas inaccessible to the human crew, ordering robots to remodel the station[9] and cyborgs to patrol access corridors.[10] She caused a massive radiation leak on the Research Level, ordered a recall of all environmental suits to prevent the crew from cleaning up and plundered the chemical storage banks, at the same time bio-contaminating the station.[11] Meanwhile, a security bot malfuctioned and fired off its cannons until it was shut down with an EMP Grenade.[12] SHODAN eventually changed access codes for the Research Level and stationed a security bot outside the Admin-Sec that refused to let anybody in.[13] Among several other serious malfunctions and haywire systems,[14][15] SHODAN used a viral mutation agent experiment contaminating researchers[16] and forcing crew shifts.[17] After that, systems and robots started suffering from serious malfunctions, flooding Maintenance with repair orders and causing speed loss in computer systems.[2] Eventually, SHODAN locked off Beta Grove and began her experiments.[18]


The patients started suffering from mental derangement and Security had to detain them to stop violent incidents. As inexplicable symptoms spread, Medical imposed quarantine measures. Some of the mutants escaped, mutilated the medics and ransacked the armory.[2] Wishing to escape the chaos, a few executives fled to Gamma Grove and jettisoned themselves from the station. However, SHODAN disabled the life support system in the launched Grove, resulting in their death.[19] As the launch of the grove tampered with SHODAN's experiments, she changed the jettison procedures to prevent more of its groves from being destroyed.[20] Another escape attempt was prevented when a group was ambushed by a military cyborg on their way to the escape pods.[21] Having reprogrammed the health regeneration rooms, anyone attempting to cure themselves was converted into a cyborg.[22]

Meanwhile Diego, fearing for his arrest, barricaded himself jammed communications and had security robots guard him.[23] When TriOp sent a transport, SHODAN used the station defenses to destroy it.[24][25] A Maintenance-Bot attacked Chauncy McDaniel when he attempted to disconnect the CPU node.[26]

Some researchers armed themselves with weapons from lockers and began a riot. As they engaged mutant beings, a security team was dispatched against them encountered strong resistance.[24]

After completely sealing and fortifying all access to the grove, SHODAN began leaking the virus and spraying the population.[27] Soon SHODAN announced its intention to control the station and cut off communications.[2] Then she tested V-5 in Beta grove.[28] Fearing for his life, Diego submitted himself to SHODAN as her servant.

Resistance members attempted to undo some of SHODAN's malfunctions like unlocking the Hospital Level and destroy the CPUs SHODAN fed on,[29] reset the cyborg converters,[30] or destroying cameras.[31] SHODAN used the CPU clusters to rotate the code, and some tried to override its control of the systems.[32] However they suffered heavy losses during their operations,[33][34] including the group carrying an isolinear chipset, until Diego betrayed them to SHODAN.[35]

The resistance eventually retreated to the executive level, until SHODAN's forces broke through. Bianca Schuler escaped with the isolinear chipset and tried to make her way to the bridge.[36][37] Diego (who by now had been transformed into a powerful cyborg) ordered her capture.[38]

Meanwhile SHODAN charged up the tachyon laser against Earth[39] Resistance members tried to cancel its firing by feeding the shield generators and overloading it.[40][41] The plan failed however and as SHODAN has complete control of the station system, the only option was to destroy the station.[42] SHODAN ordered fortification in her throne room with doors controlled by its own circuits, and a retinue of Cyborg Elite Guards.[43] A few days later she announced her plan to start a new era for humanity and herself as god.[44]


Survivors managed to send a transmission warning Earth and describing their massacre.[2]

A group of resistance fighters attempted to move for the main cyberspace terminal at the bridge.[45] SHODAN responded with tighter security[46] and resistance was taken off the bridge. SHODAN built a fortress on the Security Level, resumed the calibration of the station's tachyon laser[47] and sent a transmission against the cities of Earth.[2]

Meanwhile on Earth, James Chaskes and Rebecca Lansing coordinated actions against SHODAN.[2] They detected the Hacker who had survived after 6 months of healing coma. Following communication by Lansing, the Hacker began to retake the station, beginning with disabling the laser. The Hacker failed to reach the last pocket of survivors, who were forced to commit suicide.[48] SHODAN responded by putting Maintenance-Bots to computer rooms and guard CPUs[49] and planned to send Beta Grove to Earth, but the Hacker managed to jettison it. Finally, the Hacker set the reactor to overload, killed Diego and reached the Bridge. As Citadel Station was destroyed, the Hacker destroyed SHODAN in Cyberspace.


TriOp vessels found the bridge and rescued the Hacker while demolition crews destroyed the wreckage. The Hacker was offered a position at TriOptimum, but he declined in favour of his old habits and eventually disappeared from the spotlight. As the Hacker became the most famous person in the world, Diego's legacy was denigrated and his family suffered from hardships and lawsuits.

After the disaster, TriOptimum floundered under legal attacks and financial losses. Megacorporate government also was brought down under general unrest and rebellion. As a result, the former governments of Earth’s nations formed the United Nations Nominate.

Station Layout


The Level 5 Hangar

With 427 meters in length and a mass of 2 million metric tons, Citadel was the third largest station ever built.

Housing a crew of 438, it boasted comforting residential suites with modern amenities, a shopping concourse, fine restaurants and recreational facilities, including the environment orchards and gardens. Power recharge stations and Cyberspace Terminals are to be found everywhere. It was powered by the most powerful space-based fusion reactor; also equipped with a defense system for protection against terrorists or enemies of TriOptimum and an experimental Tachyon Laser Mining Beam for asteroid mining.

The station's software was controlled by an artificial intelligence, SHODAN.

The station is divided into several different levels. Many levels on have four sections, labelled Alpha, Beta, Gamma, and Delta, around a central hub.

  • Level R - Reactor - The lower most level consisting of the station's main reactor.
  • Level 1 - Hospital - The main hospital and medical deck.
  • Level 2 - Research - Scientific research area that conducts experiments, develops new technology and gains new knowledge.
  • Level 3 - Maintenance - Consisting of various twisting mazes this floor is used for most of Citadel's repairs, maintenance, and modifications.
  • Level 4 - Storage - The main storage area that houses a variety of the station's extra supplies that are currently unneeded.
  • Level 5 - Flight Deck - This level is the dominant hanger area that are used for transporting people and supplies among other things to and from the station.
  • Level 6 - Executive - The Executive level is home most if not all of the living areas, entertainment, and other similar locations aboard Citadel.

-The station's four garden groves are used mainly for relaxation purposes, whether or not they serve other uses such as food or oxygen is unknown.

  • Level 7 - Systems Engineering - The most prominent communication technologies onboard are found here.
  • Level 8 - Security - Most famously known for its verticality, this area is where the prominent security and military forces are stationed and kept.
  • Level 9 - Bridge - The upper most level is the Bridge which houses SHODAN and the various controls needed to move Citadel Station from place to place among various others.


Notable crew members on Citadel Station include...

  • Edward Diego



  • An unused space station model, simply named Space Lighthouse, looking exactly like Citadel Station, can be found in the game files of BioShock Infinite's endgame level. BioShock Infinite was made by Irrational Games, the developers behind System Shock 2.
  • The intro, artwork, and various screens show Citadel Station having 8 groves, when in game it only has 4.


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