Submerged cities, war treasures, old trading posts, wrecks of ships, pirate lairs... the marine and submarine world is awash with fascinating stories and legends that still ignite passion and controversy from the Atlantic to the Indian Ocean, by way of the shores of the Mediterranean or the depths of the Red Sea. Did Atlantis really exist as some people claim ? What has become of Saint-Exupéry’s plane and its pilot ? Where are the gold bars from “Rommel’s Treasure” that have never been found ? Presented in the form of an investigation, backed up by 3D reconstruction, exceptional aeral images, archive and news footage, “Heritage and Enigmas of the Marine World” revisits unsolved investigations and sets out on the trail of the myth that History has left in suspense...