In the salt ridden Red Sea, oceanographer, bestselling author and world famous marine photographer Hans Hass explores the alien world of underwater communication. Packed with extraordinary footage, the film details a wealth of marine behaviour never captured on film before, including the first ever pictures taken of a whale shark underwater. Featuring Hass’ glamorous wife Lotte, this feature-length documentary was popular with cinema audiences and critics alike - a huge commercial success, it won first prize at the 1951 Venice Film Festival. Based on his book "Diving to Adventure", "Abenteuer im Roten Meer" is an intriguing insight into a beautiful and diverse ecosystem.