1942, World War II, the German Kriegsmarine, merchant raider, Dreieck, is en-route to the Straits of Florida to attack any ships coming out of the Gulf of Mexico. When they pass through the Bermuda Triangle, they suddenly find themselves trapped in a fog that will not let them go. Shadowy monstrosities attack from their own ship, men go missing, creatures come from the deep to feed on the hapless prisoners. Their mission had been death and destruction, now they only want to survive.