|“||The WAU is reaching out to every machine, every lifeform, to manipulate, to control. It's trying to help, save its creators from all this, just like the protocol demands but, really, what is good enough? Where is the line drawn for what is human and what is not? Would walking corpses do? Would a group of machines thinking they're human be acceptable?||„|
|~ Johan Ross|
The WAU was initially developed by Carthage Industries and contained in the classified site Alpha. Although the AI's presence on Pathos-II was a common knowledge, only the three members of Carthage (Johan Ross, Mark Sarang and Julia Dahl) knew of its location.
Lacking a proper definition of the human condition or an acceptable mode of human existence, the WAU uploaded brain scans of PATHOS-II employees to robots throughout the station, creating Mockingbirds. Humans infected with the Structure Gel were bio-mechanically engineered and put in trance-like comas, unaware of their surroundings and what was happening to them.
The WAU is responsible for the creation of the various enemies Simon Jarrett faces throughout the game. It is capable of manipulating structure gel and interfering with blackboxes as well as creating life support systems for injured workers. Although Simon, Catherine and Ross have been designed or extensively modified by the WAU, it does not appear to control them in any way.
On March 7, 2102, Mark Sarang received a classified message from the supervisory board of Carthage Industries who were “very pleased to hear about your success in making the WAU a station-wide presence.” The letter insisted that Johan Ross must be able to “steer and study” the WAU from Alpha without interference.
After the catastrophic Impact Event that wiped out all surface life, the WAU's primary protocol became preserving humanity. To achieve its goal, WAU used the structure gel to physically manifest, initially occupying a large part of its core chamber, which then reached out to machines and life forms around the PATHOS-II facilities.
Shortly after the comet's impact, the WAU modified the pilot seats around PATHOS-II, originally used to pilot working robots, in order to brain scan any user. This scan caused a spike of electromagnetism surrounding the pilot helmet which also caused symptoms such as nausea and headaches to occur in the user. These seats were later used by Catherine Chun to make brain scans for the ARK project since this method proved more effective than the conventional neurograph scanning technique.
On June 6, 2103, at Theta, Imogen Reed investigated a machine that was corrupted by the WAU, dubbed the "Vivarium". The machine proved capable of creating an artificial reality, which prompted Catherine to use it as a prototype for her ARK project.
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In December 2103, Imogen Reed shut down the geothermal power generator of Upsilon in an attempt to kill the WAU, which also caused Reed's death as the ventilation-turbines shut off, killing her by asphyxiation. WAU regained power autonomously from Alpha for a limited amount of time.
Genocide at Omicron
On December 27th, 2103, Johan Ross was found by Omicron staff, appearing to be in a coma, his body was placed in a glass containment cell. The WAU instructed the structure gel within Ross's body to repair it, seemingly through the manipulation of electromagnetic fields around. Thus causing anomalous phenomena around it, such as system failure and interference in blackboxes, resulting in Ross being reanimated.
During this time, Ross tried to contact Omicron employee Raleigh Herber to fulfill his plan to destroy the WAU's heart at Alpha. The WAU reacted to this by overcharging the blackboxes of the staff at Omicron until their heads exploded, then utilizing structure gel to reanimate them.
The WAU never attempts to directly intervene with Simon and Catherine's plans to reach and launch the ARK, however its offshoots do. These include the Construct, the Fleshers, Robot Girl, the Universal Helpers, Jin Yoshida, and all the structure gel-infused marine wildlife inside the Abyss.
At Upsilon, Simon encounters the mockingbird of Carl Semken, stuck on a conveyor belt.
Amy Azzaro can be found fused into a stalk from the WAU, being kept alive artificially.
At Theta, the DUNBAT contains the brain scan of an unknown person. Upon realizing its state, it begins lashing out while cursing Catherine's name, ultimately causing the vessel to break from its dock and fall, destroying it. It is presumed that the WAU was the one who uploaded the brain scan into the DUNBAT.
Heart at Alpha
While Simon is travelling through Omicron, Ross attempts to contact Simon at random intervals in order to persuade him to help stop the WAU.
While Simon is travelling to Tau through the Abyss, Ross guides Simon towards Alpha, with the intent of using him to destroy the WAU once and for all. Ross reveals that the structure gel used by Simon to fix Raleigh Herber's Power Suit was actually a modified variant of the substance, created by Herber with the intent of using it to kill the WAU. This means that Simon is capable of carrying out Ross' initial plan.
Simon is lead to the center of Alpha where the WAU's heart resides. By this point, the WAU has already created a massive heart-like growth in the center of its chamber.
Ross pleads with Simon to kill the WAU, to which Simon can either refuse or accept by sacrificing his hand to the heart, a rudimentary way of injecting the modified structure gel into its heart. Should Simon succeed in destroying the WAU's heart, Ross will attempt to kill him in order to remove any last traces of the AI. Should Simon opt not to destroy the WAU, Ross will attempt to force him to do it.
- ↑ There's a computer log on Upsilon, dated March 9, 2104, containing the following lines "UPSILON#61633 initiates scan of subject Simon Jarrett (Aut_DavidMunshi2015v1). Command or program ApPS is unavailable; 4416cWAUcf77 is complete". This implies that the WAU was the one who uploaded the brain scan of Simon into Imogen Reed's body.