Vault 18 is one of the vaults that is unknown but is well known by the kentucky enclave this vault is in a classified location the vault is blocked by massive mountins not that many people pass them because they think its not worth passing but this vault has many expirements they are one of the dark vaults but nobody really knows about the vaults secreat the vaults location is to be somewhere in califournia if you are born in this vault you will know theres a restricted area where some vault dwellers go into but that never come out nobody know whats in there besides the enclave and the overseer of the vault but it is known that the enclave try stop it the kentucky enclave always comes to this vault

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