Sounds really kooool! Is your camera capable of doing macro shots underwater?! I think some of the colorful sealife is really neat to look at because of the colors and shapes.. And, knowing it was the bottom of the med sea would add some interest also..
Ha, just find someone with a saltwater aquarium and poke your cam in and start clicking!! We have some beautiful saltwater aquariums in the local pet shop and some really strikingly colored fish in them.. And yep, posting what you already have would be cool..