Movie Story : A German U-boat, U-234, departs the port of Kiel to trade cargo with the Japanese, and the USS Seaviper must track it down and stop the dangerous exchange. When the captain goes ashore to scout an island near Sumatra and the executive officer is wounded in battle, command falls to Mister Cutter, whose clashes with the Chief of the Boat put the submarine at risk. Trapped beneath the surface with dwindling oxygen and a Japanese destroyer hunting overhead, the crew must fight back and get intelligence about U-234 safely to Pearl Harbor.