One of the awesome features of the Olympus TG-4 is the underwater macro setting. I use the camera with the underwater case, PT-056 which allows me to use it to 45m. This photo was shot in the Cayman Islands, on a dive with Pirates Point Resort on Little Cayman. The dive spot was Jigsaw which is outside of the marine park. I did not have RAW format turned on that day, this came directly from the camera.
The Flamingo Tongue, Cyphoma gibbosum, is a type of cowry shell. The spots you see on the shell are actually part of the animal, the soft tissue, called the mantle.