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Vault 112 is a Vault-Tec Vault located in the Capital Wasteland in 2277. It is located in the southwestern part of the region, underneath Smith Casey's garage, west of Evergreen Mills and south of the charnel house.
Vault 112 was one of the last Vaults to be constructed. The construction started in November 2068, and finished in June 2074. It was intended for only 85 occupants, suspended in a virtual reality world for the indefinite duration of the Vault's experiment. The Vault was built to house and tend to the needs of its overseer, Dr. Stanislaus Braun, creator of the Garden of Eden Creation Kit. Within it, Braun installed a virtual reality simulator and Visiontron loungers, containing several simulated worlds, the last of which is the Tranquility Lane simulation.
The entrance to Vault 112 is inside Smith Casey's garage. It has some mole rats and radroaches. After proceeding past the counter and into the workshop, there is a large hatch in the floor just to the left. It can be opened by activating a switch on the wall beside it. Below it is a short passage that leads up to the Vault 112 door. More mole rats are located in front of the door.
There is an entrance area connecting to the main hall. A large room contains twelve Tranquility loungers arranged around a big pillar, each connected to a terminal that monitors the respective conditions of the "subjects" inside the loungers. There is also another Tranquility lounger, found in the overseer's office, located south of the main hall. The only medical unit of the Vault is accessed east of the main hall (where the loungers are).
Since it cannot be maintained by the human inhabitants as they are all in the Tranquility loungers, Vault 112 is instead maintained by a group of special caretaker robobrains. The Robobrains are non-hostile (even if one attacks them), and also lack combat inhibitors. When the player character enters the Vault, they are told that their arrival is "202.3 years behind schedule." Due to the indefinite duration of the Vault 112 experiment, the Vault uses geothermal power exclusively. This is provided by a Sure Power geothermal unit and backed up by an X-Tra Sure Power geothermal unit. The geothermal turbine level cannot be accessed. A Think Machine 3600r mainframe is housed in the main hall. As well as performing the functions of a normal Vault computer system, it functions as the simulation control computer, running the main simulation program and synchronizing all the different Tranquility loungers. It appears linked to several smaller computers, one handling each lounger's graphics processing and its occupant's medical status.
Because of it being maintained by Robobrains, and being better hidden than many others, 112 is the only intact Vault other than 101 in the Capital Wasteland. The outcome of this particular experiment is ambiguous. If Braun intended the simulator merely to satisfy his sadistic urges when he designed it, then it fulfilled its purpose completely. If, on the other hand, he sincerely intended to create a virtual haven for the residents to live eternally, the fact that his godlike position subsequently drove him insane and made the other residents' existence an eternal hell would mean that the experiment was a failure.
- Overseer's room password - In the equipment room.
- Vault 112 is the only Vault in Fallout 3 which is completely unaffected by radiation or hostile mutated creatures, and additionally utilizes Robobrains. Another Vault that has Robobrains is Vault 118, in the Far Harbor add-on for Fallout 4.
- Vault 112 jumpsuits can only be obtained via the Robobrain that the Lone Wanderer first encounters as well as from a room accessible from the catwalk above the main floor.
- The robobrain that states that the Lone Wanderer is "202.3 years behind schedule." If correct, that would mean the Vault was sealed in 2075, 2 years before the Great War occurred.
- If the player character enters the Vault and triggers the initial dialogue with the Robobrain about how they are 202.3 years late for their entrance into the Vault, the game will automatically begin the quest Scientific Pursuits, bypassing any that have not yet been completed. Dialogue from this point forward will reflect the new position in the plot.
- It is possible to lock oneself inside Dr. Braun's office.
- Only ten of the thirteen loungers in the main hall are in use. One is broken down, while the other two are used by both the Lone Wanderer and their dad to enter the simulation.
- The lounger monitors in the main hall can be activated. Some of them give information on the subjects, e.g. Old Lady Dithers shows "inconsistent readings" and "anomalies."
- Attacking the Robobrains will not make them hostile, however, the player will lose Karma if they destroy them. Doing so will cause the other two to become unconscious.
- The Vault's containers are safe for storage.
- This Vault is one of the few known that is still inhabited by its original occupants. Other Vaults include Vault 101, Vault 8, Vault 34 with only four dwellers not turning into feral ghouls, Vault 21, Vault 81, Vault 84 and Vault 118.
- The map in the Citadel which shows all DC area Vaults doesn't show Vault 112. Likewise, the Vault listing in Vault-Tec's own mainframe at the Vault-Tec headquarters does not mark it on the map.
- It is stated that this Vault can house 85 occupants; however there are only 13 loungers, three of which were not occupied before James' arrival.
- Though the Robobrains insist they will only allow someone to sit in the Tranquility lounger if they are wearing a Vault 112 jumpsuit when the player character's father comes to speak to them in Vault 112, he is still wearing his own Vault 101 suit.
- After completing the quest, and when the Lone Wanderer's father has left, the monitor in front of the Tranquility lounger he occupied still displays his information.
- If one runs through the fail-safe quickly, they can catch Dogmeat still in the Vault hallways before he goes back to Vault 101 if they told him to wait there for them.
- Followers are sometimes in a dark corner over by James' lounger and they will need to be told to stop waiting.
- Jericho is prone to glitch in this Vault; he will stay in exactly the same location no matter how many times one tells him to follow and will only follow after one reloads a save.
- Only James and Dr. Braun are animated with small head movements to simulate breathing. All others found in Tranquility Loungers are static, only distinguished by sex.
- James is the only one among all others found in a Tranquility lounger with his eyes open and/or blinking.
- In Fallout: New Vegas, Tranquility loungers can be seen at Hidden Valley and Nellis Air Force Base.
- The same distinctive daisy doormat found outside of Dr. Braun's lounger is also seen outside the apartment door of Herbert "Daring" Dashwood in Tenpenny Tower and at the entrance of Vault 21 in Fallout: New Vegas.
- Additional items will spawn inside the various lockers in the Vault after the Tranquility Lane simulation has been exited.
- In one of Doctor Pinkerton's journals in his terminal, it says that he stole a memory chip from the Vault and used it to give Harkness memories of a "life."
Vault 112 appears only in Fallout 3.
- Charon) may disappear after leaving Vault 112 or the Tranquility Lane simulation. If the companions enter the Vault with the Lone Wanderer, they may need to be rehired at their rehire location but will always return to where they go when you fire them, for example, Charon will go back to Underworld where you hired him, Sergeant RL-3 will go to Canterbury Commons instead of the RobCo facility. It may take a long time for them to reappear. Going to The Pitt will make Charon automatically appear at the Ninth Circle. [verified] Before entering the Vault it is recommended to instruct your followers to wait inside Smith Casey's garage and save the game because it's possible that one (or more) of the followers (e.g.
- When walking through Vault 112, screens may become monochrome purple. Upon loading a saved game in this state, the purple coloring will remain. [verified]
- When entering Vault 112, the robobrain may say, "I'm sorry, I'm not at liberty to chat right now."[verified]
- When leaving Vault 112 a second time, a door within the Vault may become glitched and prevent the player character from passing through the doorway while it is open, causing the player character to be stuck. Dropping an item/weapon, picking it up, and moving it through the door should fix this.[verified]
- When entering Vault 112, it is possible that the jumpsuits will not appear in your inventory, causing you to be unable to progress through the story.[verified]
- When you complete a part of the quest where you are asked to murder Mrs. Henderson, if you turn the security on and kill the Mr. Handy instead of allowing it to complete the mission for you, you will become locked inside of the house with no way of leaving for a short time. 'Waiting' or interacting with something should fix this. [verified]