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The screenplay by Eric Ambler, based on a best-seller by Nicholas Monsarrat, earned an Oscar nomination. Charles Frend directs Jack Hawkins as the captain of a Corvette class escort ship, ill equipped to deal with the rapacious Nazi U-boats during World War II. There's an almost documentary feel to this able portrayal of the sacrifices demanded during the Battle of the Atlantic. Donald Sinden and Stanley Baker earned recognition for their supporting roles.