Talk about dedicated to getting the shot! In National Geographics archive they the first set of colour underwater shots taken. However due to the lack of underwater lighting they relied on setting off a small explosion on the surface to get their exposures!
In 1962 William Longley and Charles Martin took their images off the Florida Keys. While they were diving, they left a raft full of magnesium flash powder floating above them. When they took the shot it would trigger an explosion, lighting the water down to 15ft!
What have you done to get a photo?! Milestones in Underwater Photography.