Hell and High Water

Richard Widmark is on quite good form here, as the veteran naval officer hired by a group of scientists to take a ramshackle old submarine from Japan to investigate some mysterious goings-on on an island under Chinese control, and where they think atomic experiments may be taking place. Setting sail with "Prof. Montel" (Victor Francen) and his assistant "Denise" (Bella Darvi) it soon becomes clear...