That's right. I dropped my Canon EOS 5D Mark III with an EF 16-35mm f/2.8 L II USM Lens attached into the Caribbean Sea. Fortunately, it was in an Ewa-Marine U-B 100 Underwater Housing.
As I have mentioned, my landscape photography plans did not work out as well as planned on my recent St John, USVI photo trip, but I had a backup plan. St John has some of the world's best snorkeling locations, and as I am sure that you are aware of by now, I have a problem with seeing something amazing and not being able to capture it photographically. The Ewa-Marine underwater housing is a very cost-effective way to make high quality underwater photography possible using your existing DSLR kit. The UB-100 model fits most DSLR cameras and small to medium-sized lenses with 77mm or 82mm filter threads.
Underwater snorkeling photography is both physically demanding and skill-challenging. I have never deleted as many bad pictures as I did on this trip, but I have no regrets and look forward to the next opportunity to shoot underwater as it is great fun and also rewarding.
Imagine swimming through a school of little fish so thick that you can't clearly see beyond several feet (with motion sickness becoming a real issue) – until a 3-4' (1m) tarpon shows up, clearing a path around it. As the fish appears, you dive down to attempt a level perspective and attempt to get good framing as the huge fish passes close by. Occasionally, you get it right and have a unique image to add to your portfolio.