Any good loot in the water?

[Out Of Bubblegum]

First: I am only talking about core game locations. I have not been to Nuka-World or Far harbor yet. Also, If there is a quest that will take you to something then please no big spoilers.

I like to explore every spot on the map in these type of games, but I draw the line at exploring underwater. You move too slow and have very limited visibility.

I know about:
The power armor near the beginning of the game.
The keys near Ole Bess (but I never found the locket mentioned in the note).
The 'whale' off the east coast. (Is a quest but I have not been to it yet)

So, are there any other treasures to find? What about just random junk - are there chests etc. all over?

[MV75]

There's another power armour in the water east of jamaica plain. The gathered military trucks and the vertibird in the water is the area. Far harbour is best for underwater stuff. There is a unique set of armour to be had exploring around, and some is underwater. But the best thing in far harbour is getting the diving suit. You have full movement, not slowed by power armour, and can breathe underwater.

[Nite69]

You can make underwater clear if you set Volumetric Lighting Enable to 0 in Fallout4Prefs.ini

C:\Users\ < windows account > \Documents\My Games\Fallout4

The detail is really insane under water on the east side of the main map, should give it a try

[Coops]

Getting the Aqua (girl)boy perk helps loads for exploring by allowing breathing underwater and not taking rads.

[MortVent]

There is a map marker mod that marks all the underwater loot crates. There is actually one near sanctuary in the middle of the lake near the mirelurk spawn (boss chest)

[watchdog79]

Go explore Dunwich Borers.

Keep some spare underwear handy, you may need it.

[death1996]

Use power armour it get stuck at bottom there crap in water
Aquaboy to help there are quest for underwater but didn't finish them yet

[Hobo Misanthropus]

After you have played Morrowind, no game's underwater Loot seems adaquate.