NANTERRE, FRANCE - JULY 30: (EDITORS NOTE: Image was captured using an underwater robotic camera.) Sung Jae Cho of Team Republic of Korea competes in the Men's 200m Breaststroke Semifinals on day four ...

A good hotel room might offer skyline views or a peaceful stretch of ocean, but what if the scene outside your window included stingrays, coral reefs, or even a curious sea turtle gliding by? Around ...