Underwater Nailer or Impact Chisel

[Bald Wookie]

If it doesnt need to be air powered, and you can use something other than nails, then Nemo Power Tools I have had good luck with.

Nemo Power Tools

Nemo is the world’s 1st Electric Waterproof Drill. Easy to carry and maneuver, and works just like that drill hanging in your garage. No need for tubes, connectors, or any other equipment–Nemo is cordless.

nemopowertools.com

 

[adurso]

I will check out underwater hydraulic equipment. This seems like the most robust/tested option, but borders on commercial diving in my mind. My team is scientific divers, so we try to keep things lightweight for underwater work.

What do you specifically want to do?