At the height of Hitler's notorious U-boat war, the crew of the U.S.S. Swordfish is taken prisoner in a battle with a German submarine. However, meningitis strikes more than half of the German crew, and there aren't enough Germans to run the submarine. Avoiding both the contagion and POW protocol, crewmembers and prisoners alike must work together to survive. It isn't until a U.S. carrier locates the ship that the men aboard the U-boat are put to the ultimate test of will and survival.