The Big Blue charts the competition and friendship between Jacques (Jean-Marc Barr) and Enzo ((Jean Reno) first in their youth, and then when they meet again at the World Free Diving Championships in Sicily years later.
A dreamy adolescent, Jacques has grown into a solitary man, caught between the solidity of the real world and the spiritual beckoning of 'the big blue'—and in particular the dolphins swimming below. He possesses a unique connection to the sea, the ability to slow his heartbeat and circulation on deep dives, a phenomenon previously only observed in whales and dolphins. Enzo, however, has become the World Champion at his sport with a very different approach. Their rivalry reignited, the pair spur each other on to deeper and deadlier dives.