The author made his first dives in tropical waters around Sri Lankka 25 years ago. Since then he explored the whole Indian Ocean with his camera, diving not only in the tourists centres like the Maldives or Seychelles, but also taking uw-photos at remote islands like Cocos-Keeling in the East of Aldabra in the West. The results are shown in this book including more than 1.000 photos from the natural habitat of the marine animals. Special emphasis was given to rare species like sharks and rays.