Time Bomb at 50 Fathoms

Two ships collide off the southern coast of Italy. One ship, with a cargo of 900 drums of lead toxin, sinks to the bottom of the sea. Ultimately, the disintegration of the metal barrels could release a "time bomb" of toxin devastating fish, plant and human life in the area. Captain Cousteau's work inspires a dedicated and brave group of men to avert catastrophe.