It’s easy to get fascinated by undersea world if you snorkel in tropics. The water is usually clear, warm and full of life. It does not have to be a first class coral reef. Even if you snorkel in a shallow sandy bay with a occasional coral block you can see a lot. If you bring a compact camera in an underwater housing you can double the fun … first get a picture/clip, then review it and share it on the surface with your friends.