It is about the Real Life rivalry between Jacques Mayol and Enzo Maiorca, pioneers in the world of breath-hold deep diving.
This show provides examples of:
- Ambiguous Ending: The American Version. Jacques swims with a dolphin from an insane depth up to the surface and swims with said dolphin under the moonlight. Roll credits.
- Deliberately Monochrome: The first part of the movie in 1960s Greece is black and white footage. Only the film's title sequence is blue.
- Happy Ending Override: The European Version in spades. Jacques is victorious in getting a world record depth of 400 feet (121.92 meters), however, his friend, Enzo, dies trying to beat his record in the competition, and after burying his friend and competitor at sea, Jacques experiences side effects of his last deep dive and ends his life following a dolphin in the vast blackness of the deep ocean, leaving a pregnant Joanna behind.