A visionary epic of obsession and beauty about Jacques Mayol, the handsome diver who is so at home in the water that he seems only half-human. Jacques' best friends are a family of playful porpoises and Enzo Molinari, his swaggering Italian diving rival. Jacques and Enzo grew up together in the Mediterranean, and remain lifelong friends despite a fierce battle for the top prize in the world free diving championships, where divers compete to see who can descend to the furthest depths of the sea with no equipment other than their own courage and determination. But when the dreamer Jacques falls in love with the beautiful Johanna, he finds himself torn between the damsel and the deep blue sea.