It's hard to light a dark suit in a dark wreck environment and still have the skin not get over exposed. I still wonder about getting the strobe farther away from the camera as I'm seeing some strobe "flare".
I don't know the settings you used on this shot, but what could also help in future is to increase your aperture a bit (or even a lot) and reduce the strobe power proportionately. This will achieve several things:
- Brighter background = better separation with the black wetsuit
- Less strobe = less flare/burnt highlight
- Less strobe = less risk of backscatter
- Less strobe = more shots per battery charge + faster recycle time
There's an excellent article on shooting in low viz in the current isue of UWP Magazine that explains this in detail
(shameless self-plug!)