Two adventurers and best friends, Roland and Manu, are the victims of a practical joke that costs Manu his pilot's license. With seeming contrition, the jokesters tell Roland and Manu about a crashed plane lying on the ocean floor off the coast of Congo stuffed with riches. The adventurers set off to find the loot.

Alain Delon
as Manu

Lino Ventura
as Roland

Joanna Shimkus
as Laetitia

Serge Reggiani
as the pilot

Hans Meyer
as Mercenary

Jean Darie
as Uncle

Jean Trognon
as Jeanjean, Laetitia's young cousin

Odile Poisson
as Yvette

Irène Tunc
as Kyobaski's secretary

Valéry Inkijinoff
as Kyobaski, producer