Time Bomb at 50 Fathoms

Off Italy's southern coast, two ships collide - and the sunken one at sea bottom has a cargo of 900 drums of toxin. Before the metal barrels disintegrate and release their poisons, a team of experts forms to execute an exhaustive recovery plan to stave off catastrophe. Using the pioneering work of Jacques Cousteau's Comshelf experiments which demonstrated that divers could live and work efficiently for a significant period of submersion - hundreds risk their lives in a race against a deadly toxic time bomb.