When Lt. John Harkness is assigned as the new skipper of a submarine chaser equipped with an experimental steam engine, he hopes that the U.S.S. Teakettle's veterans will afford him enough help to accomplish the ship's goals. Unfortunately, he finds the crew and its officers share his novice status or only have experience in diesel engines.
A US Navy submarine, the USS Corsair, is operating in the North Atlantic, hunting German merchant raiders that are preying on Allied shipping. Its new executive officer, Lt. Ward Stewart, has been transferred back into submarines after commanding his own PT boat. At the submarine base in New London, Connecticut, he asks his new captain, Lt. Cmdr. Dewey Connors, for a weekend leave to settle his affairs before taking up his new assignment. On a train bound for Washington D.C., Stewart accidentally encounters New London school teacher Jean Hewlett and her students. Despite her initial resistance to his efforts, he charms her and they fall in love.
On the eve of WW-I the French Navy ship Lafayette returns to its Toulon base for one night. There is no shore leave, although wives are permitted to come to a party. The strain of command on the older captain and his new, young wife is very great.
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.
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.
The Silver Fleet was inspired by a true story from World War II. Holland now under German occupation, a Shipyard owner and Chief engineer Jaap van Leyden is summoned to build ships for the German war effort. The commission would allow Leyden to build sophisticated submarines whilst safeguarding jobs for the local Dutch workforce. A newly built U-boat, named U107 goes out on her first sea trial and is hijacked by a Dutch crew and they re-route the vessel to England. As such it provided an opportunity to refuel patriotism in the face of a seemingly interminable war and almost unbearable civilian hardship.
On a volcanic island near the Kingdom of Hetvia rules Count Dakkar, a benevolent leader and scientist who has eliminated class distinction among the island's inhabitants. Dakkar, his sister Sonia and her fiance, engineer Nicolai Roget have designed a submarine which Roget pilots on its initial voyage just before the island is overrun by Baron Falon, despotic ruler of Hetvia. Falon sets out after Roget in a second submarine and the two craft, diving to the ocean's floor, discover a strange land populated by dragons, giant squid and an eerie undiscovered humanoid race.
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.
A U.S. Navy crew aboard a merchant marine ship battle Nazis.
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.
When a giant stone statue on Wester Island is disturbed, the legendary monster Jiger appears and heads for Japan. Gamera tries to stop this new rival, only to be injured when Jiger lays eggs inside of him. As two boys in a submarine go on a dangerous quest inside of Gamera's body to save him, Jiger threatens the Expo '70 world's fair in Osaka.
A New York City doctor tries to rescue a young woman from Nazi agents.
After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs.
A wealthy woman funds an underwater expedition to explore for marine life, but what she doesn't know is that her "colleagues" have other intentions.
When a covert mission to rescue a kidnapped CIA operative uncovers a chilling plot, an elite, highly trained U.S. SEAL team speeds to hotspots around the globe, racing against the clock to stop a deadly terrorist attack.
A German submarine is sent to the Orkney Isles in 1917 to sink the British fleet.
Panic arises among Allied POWs aboard a Japanese freighter when they learn that the ship is actually a decoy target for American submarines on night patrol. The prisoners unite and attack their Japanese captors just as an American sub surfaces and, not knowing the prisoners are aboard, prepares to torpedo the ship.
A British merchant ship is torpedoed by a German U-Boat and takes shelter in a neutral port. The Captain then strikes back at the German enemy.
The film, a parody of the novel Twenty Thousand Leagues Under the Sea by Jules Verne, follows a fisherman, Yves, who dreams of traveling by submarine to the bottom of the ocean, where he encounters both realistic and fanciful sea creatures, including a chorus of naiads played by dancers from the Théâtre du Châtelet. Méliès's design for the film includes cut-out sea animals patterned after Alphonse de Neuville's illustrations for Verne's novel.
A US submarine runs into a time rift. A special unit goes on a mission to see what's on the other side. They find themselves in an alternate dystopian America, now a one-man dictatorship. They decide to help the rebels.