The Vault-Tec terminal in the Citadel lists Vault 76 as a "control" vault located in Virginia, with 500 occupants. The vault was designed to open 20 years after a nuclear war, and was among the seventeen known control vaults, meaning that it was used as a baseline to compare to experimental vaults. It is also mentioned in one of the
alien captive recorded logs(no.13) recorded by
Giles Wolstencroft, a Vault-Tec official who was abducted while inspecting the vault's construction site. In
Fallout 4, the newsreader in the prologue mentions Vault 76 debuting in 2076 in honor of America's tercentenary when discussing Vault-Tec's plans to expand.
