The Fallout games feature some notably strange lore, a byproduct of the time they were created and the sort of roleplaying that defined the earliest entries. Of course, fans can really only be familiar with the content that made it into the franchise, as there's plenty of cut quests, locations, and more that never saw release. For Fallout 4, specifically, one piece of cut content sounds like it could've spiced the experience up.
During a recent Reddit AMA, Bethesda's Todd Howard spent some time discussing Skyrim's 10th anniversary, among other things. Fans posed questions about Howard's career, what sort of game he would develop with infinite resources, and about cut content in Bethesda's games. Redditor inexplicablehaddock asked about Vault 120, an underwater Vault that was cut from Fallout 4, pressing Howard for information about what the Vault would've entailed. The answer wasn't what many were expecting.
According to Howard, Vault 120 was inspired by the BioShock games, which likely means that players would've gone through a madhouse of Vault Dwellers driven insane by their circumstances. What makes the Vault 120 concept particularly interesting, though, is that it would have featured a "massive sentient octopus living outside it." Howard didn't elaborate beyond that, though it was enough to spark some interesting reactions from fans.
The general consensus seems to be fans asking for Fallout 4 modders to restore the cut content, though it's likely not feasible if it hasn't been done already. Others simply commented on how interesting the concept is, wishing that it had made it into the final cut of Fallout 4. The franchise has done similarly bizarre concepts before, like Fallout 3's Mothership Zeta expansion or Fallout New Vegas' Lily Bowen companion, who was a Super Mutant that believed herself to be a grandma.
It's not uncommon for such interesting content to be removed from a game, the only remaining notion that it ever existed being leftover files in a game's data or stories from developers years down the line. From time to time, that content will emerge later on, either as part of a DLC pack or in a future entry in a franchise. Fallout 4 support ended years ago, though, so it's unlikely fans will ever see it there.
However, Bethesda has a one-pager for Fallout 5. That only means that high-level concepts are being thought of at the moment, and a final release could be nearly a decade away, but it's possible fans finally get to meet the sentient octopus creature when the next Fallout game releases.
Fallout 4 is available now on PC, PS4, and Xbox One.