Underwater b&w

Now finished with Open Water and Advanced Diver certifications I set about obtaining an underwater camera  but was disappointed to find all that was available was an older 8MP point and shoot camera in a waterproof housing.  A problem arises since different wavelengths of light travel at significantly different speeds underwater and the slight difference surface refraction makes when you are looking at someone two feet under pool water is amplified by the time you get 50 feet.  By the time you get down 100 feet there is no more red visible in the spectrum and its actual appearance ranges from deep purple to black, which has a terrible effect on the perception of skin tone making your dive buddy look somewhat like a zombie. This leaves terrible conditions for color photography unless you have years to perfect the skill, which I do not.  In comes b&w...