Vault 1 was never intended to hold civilians. It was designed as the Central Vault, where Vault-tech would monitor it's insidious human experiments. However, when 100 people from the nearby vault 4 have nowhere to go, a kind employee offers them shelter in vault. 350 years after the bombs fell, Chilled, descendent of the original Vault- tech worker who let the civilians in, exits the vault into the harsh wasteland, that was Seattle. (typed on mobile, apologize for typos)