In late 1941, Germany controls the Atlantic with their U-Boats which inflict heavy damages on any merchant ships passing from US to UK. The movie starts in 1942 with Gus and Anders on a sailboat, boarded by a German naval party. The German captain (Tim Seyfi) is offended by Gus and Anders drunk playboys act and orders that the sailboat be set on fire with kerosene. The German sailors discover armed men hiding in the bowels of the boat, who open fire. Anders slashes the throat of the German captain, and the boarding party is massacred. The German crew came from a destroyer nearby. Freddy is a diver, who had set explosives to the hull of the destroyer. As the destroyer starts firing on the sailboat, the explosives go off and the destroyer sinks.