The diver had to be a good 30 feet from where I sat in front of the massive kelp forrest tank at the aquarium. The glass behind which she swims wasn't designed with photography specifically in mind. The light was low, the diver and her friends were in constant movement. Technical details as below; to illuminate the diver's face, I employed the dodge tool with Aperture, the program from Apple I use most often use when tweaking my photographs.