Underwater. Diving at Sipadan, Mabul, and Kapalai in East Malaysia (Sabah), February 2006. All photos with Nikon D70 in an Aquatica housing with SB125 flash, and Sigma 12-24 and Nikon 50mm f/1.8 lenses
I'm using a housing for the camera, i.e., a large aluminium construction with a big lens upfront and buttons/knobs that let you operate the camera inside. Aquatica is the manufacturer of the one I use, but you'll be able to find many others, like Sea&Sea, Subal, Ikelite.
Thanks!