Vault 13

Vault 13 (or V13) is one of the Vault series of fallout shelters developed by Vault-Tec. Specifically, it is the home of the Vault Dweller. Fallout begins in Vault 13, and it is eventually referred to as the "Holy 13" in Fallout 2. V13 also plays a major role in the Master's plan, as it is one of the few remaining untouched Vaults when Fallout begins.