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Vault 29 is one of the Vaults built by Vault-Tec. It is located on the West Coast and housed the children - mostly teenagers - of affluent families.[1]


A student named Trisha Miller attended Vault-Tec University, writing that she was concerned that her assignment would be a janitor in Vault 29 on the west coast, with "with a bunch of obnoxious rich teenagers."[1]

As part of the Vault experiment, it was meant to be populated by young children, with the original inhabitants being no more than 15 years old.[Non-canon 1] Harold emerged from Vault 29 in 2090.[Non-canon 2]

This Vault's experiment was devised by scientific genius Derek Greenway. Most of the parents were either "accidentally" redirected to other Vaults or were in the early stages of health conditions that would no doubt cause them to die soon after entering the Vault. Instead of a human controller, Vault 29 would have a ZAX super-computer. The ZAX would be programmed to raise children with the aid of robotic helpers, educate them in a primitive culture, and upon their reaching maturity, release them into a controlled environment. They would then be free to rebuild society from the ground up.

At one point Greenway explained his plans for Vault 29 to Diana, the human brain connected to a powerful computer, to see what her opinion would be. He was quite surprised when Diana was appalled at the idea. She said that, although the idea had merit, she found it to be morally objectionable on several levels. She recommended that the plan be scrapped. When Derek refused to do so, Diana took it upon herself to become involved with the project without his knowledge.

When the Great War started and civilization began to fall apart, Diana appropriated control of a satellite dish and aimed it at Vault 29. She then transmitted a series of security codes to the Vault's ZAX unit and gained control. Over the years that followed, Diana was able to see to the upbringing of the children. Every year she ordered a worker robot to leave the Vault under the pretext of checking conditions outside. In reality, they were preparing an area - the village of Twin Mothers - to receive the Vault populace when they were ready to leave. Lastly, she had a series of projectors installed at strategic locations, ready to project her chosen image. Finally, when the Vault doors were opened the inhabitants found Twin Mothers built. Everything was coming together, Diana was ready to play god. By 2253, the Vault itself has ceased working, but it's still a holy place to the inhabitants of Twin Mothers.[Non-canon 3]


Vault 29 is mentioned in Fallout 76. It was meant to appear in Van Buren, the canceled Fallout 3 project by Black Isle Studios.

Behind the scenes

  • Early Van Buren leaks note the Twin Mothers Vault as 31 rather than 29.[Non-canon 4]
  • The Twin Mothers design document describe the Vault as being inhabited by older parents with infant children.[Non-canon 3] The Fallout Bible notes that the Vault contains only children with adults diverted elsewhere.[Non-canon 1]
  • In Fallout, Harold mentions being from a Vault, but does not specify which Vault.[2] The Fallout Bible is the only source that states that Harold emerged from it in 2090.[Non-canon 2]


  1. 1.0 1.1 1.2 Last day of school
  2. The Vault Dweller: "{112}{}{What happened to you?}"
    Harold: "{115}{HROLD4}{Well, after the Great War, my Vault was one of the first to open. [Takes a deep breath] Whew. Long time.}"
    The Vault Dweller: "{116}{}{Tell me more about those days.}"
    Harold: "{118}{HROLD5}{All started with the sirens. I was young, but ohh, I do remember that. Lotta terrible years followed. And I remember walking outta the Vault late one morning.}"
    The Vault Dweller: "{120}{}{Where was your Vault located?}"
    Harold: "{122}{HROLD6}{You know, [cough] I'm not real sure anymore. West, I think. Uh wait - east? Ooh I don't know. [Hacking cough]}"


  1. 1.0 1.1 Fallout Bible 0: "Vault 29: No one in this Vault was over the age of 15 when they entered. Parents were redirected to other Vaults on purpose. Harold is believed to have come from this Vault."
  2. 2.0 2.1 Fallout Bible 0: "2090: Vault 29 opens. Harold (now human) sets out to make his fortune as a trader, making the circuit around the survivalist communities in the wasteland."
  3. 3.0 3.1 Twin Mothers design document
  4. Van Buren leaks at No Mutants Allowed