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As Hitler's grip of fear continues to tighten during World War II, the capture of the U.S.S. Swordfish by a German U-boat leads to a brutal struggle for survival between axis and allies deep beneath the ocean surface. Following the capture of the U.S.S. Swordfish, the German crew soon begins to fall ill to a particularly powerful strain of meningitis, leaving the American prisoners-of-war obligated to work with the remaining German crew to keep the vessel from descending to the bottom of the ocean. Though they are able to cast aside their differences in the name of survival, the discovery that the ship has been located by a U.S. carrier forces the prisoners into a harrowing struggle for survival.