The Last Adventure (1967)

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.
Robert Enrico
Alain Delon, Lino Ventura, Joanna Shimkus, Serge Reggiani, Hans Meyer, Jean Darie, Jean Trognon, Odile Poisson, Irène Tunc, Valéry Inkijinoff, Raoul Guylad, Jean Landier, Guy Delorme, Paul Crauchet, Patrick Bernhard, Roland Fleury, Mick Besson, Jean-Paul Blonday, Jean Falloux, Gaston Meunier, Thérèse Quentin
tt0061376