Had a rough couple days in Cozumel a couple months ago. Arrive on the island only to find out that my S&S TTL controller is D-E-D dead. Coupled with a hurricane passing by, we lost dive days and had to deal with some sporty currents, but at least had a little natural light.
These aren't great, but considering the odds stacked against, they came out alright. I got a bunch more, but didn't want to flood the forum as a new poster.
All images with were with a 5d3 in a Sea & Sea housing w/dome, 16-35 2.8L, no strobes so wide open aperture which unfortunately screws my DOF. I really don't like the way images look on the 5d3 at high ISO, so I opted for the DOF hit. Sadly the selfie is probably the best photo I got the whole week.
ETA: Tried using imgur to keep the files off Wetpixel. Are imgur links not allowed? I was trying to save bandwidth on the site but I guess it's not possible to do that here?