But wait, here's another:
One player has stumbled upon something interesting underwater: When clearing out a raider camp, a player fell into the sea and he decided to wander around a bit before heading for dry land. Equipped with the Power Suit and Mirelurk Cakes (they let you breath underwater, if you didn't already know), he went exploring and found a mysterious underwater structure.
You can see more images of the structure here ; it looks like a pump station of some kind but it's impossible to tell for sure. The big question is, why is it there? Did Bethesda leave it in for a reason? Or was it part of a scrapped idea to include underwater missions? Who knows? Maybe you should try to find it yourself.
Been playing too much Fallout 4 ? You might appreciate this parody video , provided you've got a sense of humor about your new addiction.
Related Game(s): Fallout 4