The ocean is found on the very east of the Commonwealth. There is not much to see in the depths except sunken ships and crates at the bottom.
- The Yangtze is located in the water just south of Boston Airport and north east of the Four Leaf fishpacking plant.
- There is an upside-down ship with a lot of cat pictures and the word "Meow" scratched in the middle.
- Libertalia is a raider floating fortress located north of Fort Strong and just south of Nahant Wharf.
If one goes deep enough, the water will clear up. This is most likely a bug, as it only occurs when facing down.