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American naval forces are using a port in Iceland as a base for anti-submarine patrols to protect North Atlantic convoys from Nazi subs. The Nazis send undercover agents into the port in a scheme to blow up the entrance to the harbor and keep the patrols blocked in. The officers in charge of the patrols have to find the spies and stop them before they achieve their objective.

A U.S. Navy crew aboard a merchant marine ship battle Nazis.

On December 6, 1941, Captain Yamanada of the Japanese aircraft carrier "Hiranamu", orders full steam ahead for Pearl Harbor. His ship encounters and sinks an American yacht and the single survivor, Sue Curry, is rescued by an American submarine, the "Sea Serpent", commanded by Commander Chris Warren. He hears her story and attempts to radio a warning to Pearl Harbor. Yamanada, hearing the signals, orders the airlines jammed, and then sends his son into the air to sink the sub. The attack fails, after the sub makes a crash dive, but they fail in their warning attempts. The next morning, December 7th, the men on the sub hear the story of the bombing of Pearl Harbor, and devise a desperate plan to sink the Japanese carrier by letting the carrier know their position. The carrier comes in search of the submarine.

Two Finnish filmmakers and an international team of divers embark on a quest to find the lost WWII German U-boat, U-479, in the Gulf of Finland. Despite Soviet claims of its sinking by the submarine Lembit, unanswered questions prompted the filmmakers to investigate the mystery firsthand.

A young American has her ship torpedoed by a German U-boat but makes it back to her ancestral home in France, where she witnesses German brutality firsthand.

Jennifer Smith heads a "Consumer Reports"-type company and her reputation for honesty is her greatest asset. While out boating one day she encounters a secret prototype submarine piloted by Bill Craig. Trying to explain her absence after her boat sinks becomes very difficult as Bill and his cohorts attempt to discredit her story.

Direct to DVD movie: The German U-Boat, U-234, from the Port of Kiel is trading cargo with the Japanese. USS Seaviper must locate and stop this dangerous exchange. The Captain of USS Seaviper must go ashore to conduct reconnaissance on an island near Sumatra, but the ship is left in the hands of Mister Cutter, after the Executive Officer is injured in battle. A conflict between Cutter and the Chief of the Boat puts the submarine in jeopardy. Seaviper is trapped below the surface, with decreasing oxygen, and a Japanese destroyer hunting them from above. Damage to the boat also leave her survival in question. They must fight the Japanese destroyer and get the information about U-235 back to Pearl Harbor.

Ship engineer Jim Taggert is rescued from a torpedoed tramp steamer by Joe Morgan, an American gangster that found New York too hot for him, and has become a fisherman operating from an out-of-the-way island off of the coast of South America. Morgan makes his headquarters at the Halfway House run by the parents of Maria Styx as a bar and dance resort catering to the planters and traders of the island. Taggert finds himself practically a prisoner along with a group of American girls acting as entertainers at the resort. Taggert shadows Morgan in his activities in a remote cove and finds that Morgan is supplying German U-boat commanders with torpedoes, but does not know that Morgan has rigged the torpedoes with clock devices that explode when at sea and sinks the U-boats.

During a WWII a duel starts between Soviet war ship and Nazi submarine.

The film takes place aboard an American submarine in the Pacific during World War II. The sub's commander is ordered to stop and pick up an underwater demolition team led by Lt. Hayes, whose mission is to locate and destroy a US submarine sunken in a lagoon off Bikini Atoll before the Japanese are able to raise it and capture the advanced radar system on board.

A first-time captain leads a convoy of allied ships carrying thousands of soldiers across the treacherous waters of the "Black Pit" to the front lines of WWII. With no air cover protection for 5 days, the captain and his convoy must battle the surrounding enemy Nazi U-boats in order to give the allies a chance to win the war.