if anything, play FO3 and look for Vault 112. They were constructed in order, so the abilities of 112 could provide clues to the environment of 111, which could explain the pre-war sections of the FO4 trailer.
if anything, play FO3 and look for Vault 112. They were constructed in order, so the abilities of 112 could provide clues to the environment of 111, which could explain the pre-war sections of the FO4 trailer.