Hell and High Water (1954)

A superbly tense Cold War drama, with a difference. A mysterious nuclear explosion occurs in the North Pacific, this film explains how it happens. Former submarine captain Jones (Richard Widmark) is recruited by a covert group, which includes the famous nuclear scientist Montel (Victor Francen) - who had recently been reported missing. They want him to command a former Japanese World War 2 submarine to investigate what is going on on some islands in the North Pacific...

Along with Montel and the rather more comely scientist Gerard (Bella Darvi), the submarine heads North. Only escaping an encounter with a Red China submarine by the skin of their teeth. When they reach the island they discover an ingenious plot to crash a former US bomber with a nuclear bomb in Korea...

This film combines submarine warfare with Cold War escapades and does it really well. The characters may be a bit one dimensional perhaps but the film is packed with so much action there probably wasn't the time.