Weighing two tons, the ocean sunfish, or mola, is the biggest and most curious bony fish of the sea. In this documentary, underwater filmmaker Thomas Behrend captures one of these gigantic fishes on film. For shooting in great depths, a super-high-tech submarine camera was used, which ensured sensational shots. Though the manatees in Florida are gentle, Behrend shows us that they lead exciting lives. Thanks to his observations, several hypotheses on the behavior of these ocean dwellers were confirmed.