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Morning Departure isn't about a commuter train but instead the story of an imperiled submarine. On a routine postwar mission, the sub strikes a forgotten mine and sinks to the bottom. The twelve-man crew comes face to face with the probability of permanent entombment and eventual suffocation; the tension is sharpened when it is learned that eight of the men will be able to escape, but four will have to stay behind. The film concentrates on the wildly varying reactions of the officers and crew, from stiff-lipped stoicism to raving lunacy. Based on a play by Kenneth Wooland, Morning Departure was released in America as Operation Disaster.