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Vault 120 would have been inhabited by a massive sentient octopus outside the vault and mutated sea creatures. Whichever faction you sided with to guard Diamond City would then remain in the city guarding it this is actually the one aspect that did remain in the game, though adjusted to occur after the player either destroyed the Institute or completed Airship Down.ΔΆ0 Leagues Under The Sea would have involved the Sole Survivor going to Vault 120 which was underwater.
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If for any reason the player was kicked out of the current faction related to the quest, it would default to the Minutemen.
![fallout 4 vault 101 mod fallout 4 vault 101 mod](https://media.moddb.com/images/mods/1/17/16048/Fallout3_2010-08-28_16-29-41-84.jpg)
Several script remnants still exist for this quest, and indicate the following: The mission would have taken place before The Nuclear Option.