I have shot pictures for some years with a Olympus 720 mju sw, which is waterproof to -3 meters. And this camera is perfect for snorkeling. The underwater world is just so completely different, that I often take a look on my pictures to memorize the experience of this particular day. Now shifted to a Sony TX30 with a Carl Zeiss lens (wide, 25 mm/3 x zoom). This has panorama function, that even works from above to under water in one take!