Two men answer the call of the ocean in this romantic fantasy-adventure. Jacques and Enzo are a pair of friends who have been close since childhood, and who share a passion for the dangerous sport of free diving. Professional diver Jacques opted to follow in the footsteps of his father, who died at sea when Jacques was a boy; to the bewilderment of scientists, Jacques harbors a remarkable ability to adjust his heart rate and breathing pattern in the water, so that his vital signs more closely resemble that of dolphins than men (he even considers a school of dolphins as his extended family). As Enzo persuades a reluctant Jacques to compete against him in a free diving contest — determining who can dive deeper and longer without scuba gear — Jacques meets Johana, a beautiful insurance investigator from America, and he finds that he must choose between his love for her and his love of the sea.
The charismatic criminal Dobermann, who got his first gun when he was christened, leads a gang of brutal robbers. After a complex and brutal bank robbery, they are being hunted by the Paris police. The hunt is led by the sadistic cop Christini, who only has one goal: to catch Dobermann at any cost.