dmora
Answer: You need strobes. 
http://www.adorama.com/alc/article/Underwater-Light-Get-Rid-Of-The-Blues
Light spectrum falls apart the deeper you go starting with reds then orange/yellow.

http://www.adorama.com/alc/article/Underwater-Light-Get-Rid-Of-The-Blues
Light spectrum falls apart the deeper you go starting with reds then orange/yellow.