The Atlantic Ocean, referred to in-game as just the ocean, is a massive body of water dividing the Americas from Europe and Africa.
- A buried T-rex skeleton can be found southeast of the Coastal grotto.
- The wreck of the USS Ozymandias can be found east of the Ritual site.
- The wreck of the SSN-37-1A, a Chinese stealth submarine, can be found southwest of Calvert Mansion.
- The Yangtze is located in the water just south of Boston Airport and northeast 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 fortress made from and in the remains of pre-War shipwrecks, much of which floats in the water 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.