Rafael Bardem Jr.

This French film is one of the many efforts to film Jules Verne's novel, Mysterious Island. Here Captain Nemo is Omar Sharif, a seriously misanthropic man, who hides near a tropical island in his fabulous submarine. Flying in on a balloon are a number of refugees from a military dictatorship. The heroes of the story escape as Nemo battles pirates and an erupting volcano. (allmovie)

A group of escaped American prisoners, traveling in a hot air balloon, have to land on a remote islands and must try to survive there. (imdb)