The American submarine Grayfish, under Lieutenant Commander/Commander Barney Doyle (Glenn Ford), searches for the Shinaru, one of the Japanese aircraft carriers that led the attack on Pearl Harbor. Doyle receives word that the target has an escort, including a transport ship carrying his wife and child, who were captured in the Philippines.
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 (Tyrone Power), 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 (Dana Andrews), 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 (Anne Baxter) and her students. Despite her initial resistance to his efforts, he charms her and they fall in love.
The plot revolved around the recent incident involving the German commander Baron von Luxburg who sank an Argentine ship intending to frame the Entente for the act. Reports from survivors helped everyone to realize what had truly happened.
Le sous-marin nucléaire soviétique "K219" patrouille dans les eaux internationales de l'océan Atlantique avec à bord seize missiles pointes vers les Etats-Unis. Un sous-marin américain le détecte et commence à le prendre en chasse. Le commandant russe fait effectuer une manoeuvre périlleuse a son équipage pour affoler les Américains. C'est la collision. Le feu se déclare a bord du sous-marin soviétique. Pour les équipages des deux navires, commence alors une bataille contre le désastre qui risque de s'abattre sur les plus grandes villes des Etats-Unis.
Lt. Commander Thomas Dodge (Kelsey Grammer), a capable yet unconventional US Navy submariner, is about to be passed over a third time for command of his own nuclear submarine because of his unorthodox methods and because of a notorious genital tattoo received after getting drunk and passing out while on shore-leave. Failure to secure a command will result in Dodge being dropped from the Navy's command program and an assignment to a desk job, and that means he will resign from the Navy. During his career, Dodge has made an enemy of Rear Admiral Yancy Graham (Bruce Dern), who strongly speaks out against Dodge's command promotion.
While scuba-diving near shipwrecks off Bermuda, vacationing couple David Sanders (Nick Nolte) and Gail Berke (Jacqueline Bisset) recover a number of artifacts, including an ampoule of amber-colored liquid and a medallion bearing the image of a woman and the letters "S.C.O.P.N." (meaning "Santa Clara, ora pro nobis" or "Saint Clara, pray for us") and a date, 1714. Sanders and Berke seek the advice of lighthouse-keeper and treasure-hunter Romer Treece (Robert Shaw) on the origin of the medallion, who identifies the item as Spanish and takes an interest in the young couple. The ampoule is noticed by the man who had rented diving equipment to Sanders and Berke, which in turn attracts the attention of Henri Cloche (Louis Gossett, Jr.), a local drug kingpin for whom the shop owner works, who unsuccessfully tries to buy the ampoule and then begins to terrorize the couple with Haitian black magic. The ampoule contains medicinal morphine from the Goliath, a ship that sank during World War II with a cargo of munitions and medical supplies. The wreck of the Goliath is considered dangerous and is posted as off-limits to divers due to the danger of explosions. Treece concludes that a recent storm has exposed her cargo of morphine and unearthed a much older wreck containing Spanish treasure.
Phaedra (Sophia Loren) is a poor Greek sponge diver who accidentally finds an ancient Greek statue of a boy riding a dolphin on the bottom of the Aegean Sea. Her efforts to sell it to the highest bidder lead her to two competing individuals - Dr. James Calder (Alan Ladd), an honest archaeologist with an academic's bankroll, and Victor Parmalee (Clifton Webb), a wealthy but unscrupulous art collector.
A strange giant "sea creature" has been rampaging the seas. The American naval ship Abraham Lincoln is sent to investigate, but is rammed by "the creature" which turns out to be The Nautilus, the fantastic submarine of the enigmatic Captain Nemo, and "Rudderless, the 'Abraham Lincoln' drifts on". Then, in "A strange rescue" he guides the sub to surface under those pitched overboard and his crew take them, including Professor Aronnax, and his daughter (who are French) below through a hatch in the surface of the deck. After they pledge not to escape, Nemo shows them the wonders of the underwater world, and even takes them hunting on the sea floor.
Amidst a storm, a boat is being piloted across the South China Sea by John Finnegan (Treat Williams). With him are his crewmen Joey "Tooch" Pantucci (Kevin J. O'Connor) and Joey's girlfriend Leila (Una Damon). Finnegan has been hired to transport a group of mercenaries, led by a man named Hanover (Wes Studi), to an undisclosed location in the middle of the ocean.
In 1953, renowned French scientist Professor Montel (Victor Francen) goes missing. The authorities believe that he and four other scientists defected behind the Iron Curtain.
A alien spacecraft is discovered on the floor of the Pacific Ocean, estimated to have been there for 300 years. A team of experts, including marine biologist Dr. Beth Halperin, mathematician Dr. Harry Adams, astrophysicist Dr. Ted Fielding, psychologist Dr. Norman Goodman, and U.S. Navy Capt. Harold Barnes, are assembled and taken to the Habitat, a state-of-the-art living environment located near the spacecraft.
After MI6 agent James Bond, 007, fails a routine training exercise, his superior, M, orders Bond to a health clinic outside London to get back into shape. While there, Bond witnesses a mysterious nurse named Fatima Blush giving a sadomasochistic beating to a patient in a nearby room. The man's face is bandaged and after Blush finishes her beating, Bond sees the patient using a machine which scans his eye. Bond is seen by Blush and an attempt is subsequently made to kill him in the clinic gym, but Bond manages to defeat the assassin.