Academy Award winner Humphrey Bogart stars as a hero of the wartime merchant marine in Action in the North Atlantic. World War II, The United States has been supplying its ally the Soviet Union, as that country valiantly fights the invading German Army. But the supply lines cross the frigid, treacherous waters of the North Atlantic. When his ship is torpedoed by the Germans in mid-ocean, first mate Joe Rossi (Bogart) rallies the survivors of his crew to navigate their tiny lifeboat to land. After their harrowing journey, the brave seamen have only a brief time ashore before they set out to sea again, daring another crossing through submarine infested waters to supply the desperate Russians.