Take a fascinating journey into the mysterious innermost depths where champion free divers plunge into a world of silence, darkness and pressure. Professional deep sea divers recount what it"s like to spend weeks in a totally alien environment. Learn the harrowing tales of people, including a pregnant lifeguard, who have survived violent shark attacks. And hear the horrifying story of servicemen on board the USS Indianapolis, who were forced to spend fie excruciating days in shark-infested waters after a 1945 torpedo attack.