TWENTY THOUSAND LEAGUES UNDER THE SEA (1954)

20,000 Leagues Under the Sea is a 1954 American science fiction adventure film directed by Richard Fleischer, from a screenplay by Earl Felton. Adapted from Jules Verne's 1870 novel of the same name, the film was produced by Walt Disney Productions. It stars Kirk Douglas, James Mason, Paul Lukas, and Peter Lorre. Photographed in Technicolor, the film was one of the first feature-length motion pictures to be filmed in CinemaScope. It was also the first feature-length Disney film to be distributed by Buena Vista Distribution.

PLOT
In 1868, rumors spread of a sea monster attacking ships in the Pacific Ocean. Professor Aronnax and his assistant, Conseil, are asked to investigate, and board a U.S. Navy frigate. They are joined by master harpooner Ned Land.
After months of patrolling, the monster is spotted. The frigate's guncrew open fire, but the monster rams the warship. Ned, Conseil, and Aronnax are thrown overboard while the disabled frigate drifts away. While clinging to wreckage, Aronnax and Conseil come upon a metal vessel and realize the monster is a man-made "submerging boat" that appears deserted. Below decks, Aronnax finds a large viewport and witnesses an underwater funeral, while Ned arrives on an overturned longboat from their ship. Spotted by the divers, Ned, Aronnax, and Conseil attempt to leave in the longboat, but they are captured. The vessel's captain introduces himself as Captain Nemo, master of the Nautilus. He returns Ned and Conseil to the deck while offering Aronnax, whose name he recognizes, the chance to stay. After Aronnax proves willing to die with his companions as the ship submerges, Nemo allows Ned and Conseil to remain aboard.
Nemo takes Nautilus to a penal colony island, where the prisoners are loading a munitions ship. Nemo, once a prisoner there as were many of his crew, rams the steamer, destroying it and its crew. Nemo tells Aronnax that he has just saved thousands from death in war, and that "this hated nation" tortured his wife and son to death while attempting to force him to reveal his discoveries. In Nemo's cabin, Ned and Conseil discover the map coordinates of Nemo's secret island base, Vulcania, where Nautilus is now heading. Ned throws messages with Vulcania's coordinates overboard in bottles in the hope of being rescued.
Off the coast of New Guinea, Nautilus becomes stranded on a reef. Nemo allows Ned to go ashore with Conseil, ostensibly to collect specimens, while admonishing them to stay on the beach. Ned instead goes exploring for avenues of escape, and finds human skulls posted on stakes. Ned runs back to Conseil, and they row away pursued by cannibals. Aboard Nautilus, the cannibals are repelled by electrical charges sent through its hull, and Nemo confines Ned for disobeying orders.
A warship fires upon Nautilus, which descends into the depths, attracting a giant squid. After an electric charge fails to repel the creature, Nemo and his men surface during a storm to dislodge it. Nemo is caught by one of its long tentacles, and Ned, having escaped from captivity, fatally harpoons the squid, and saves Nemo when he is pulled into the sea. Having had a change of heart, Nemo decides to make amends with the world.
As Nautilus nears Vulcania, Nemo finds the island surrounded by warships, with marines having disembarked. The Nautilus enters his base through an underwater passage, and surfaces within its extinct volcano lagoon. Nemo rushes ashore to activate a time bomb in order to destroy any evidence of his discoveries but is shot and mortally wounded as he returns onboard. Navigating the submarine to a safe distance from Vulcania, Nemo announces that he will be "taking the Nautilus down for the last time". His crew declare that they will accompany their captain in death.
Aronnax, Conseil, and Ned are confined to their cabins, while Nautilus's crew retreat to their own at Nemo's instructions. Ned escapes and surfaces the submarine, striking a reef in the process, causing Nautilus to flood. Nemo dies while viewing his beloved undersea domain through the hull's viewport.
Aronnax tries retrieving his journal, but the urgency of their escape obliges Ned to knock him unconscious and carry him out. Aboard Nautilus's skiff, the three companions, along with Esmeralda, Nemo’s pet sea lion, witness Vulcania explode. A large, billowing mushroom cloud rises above the island's destruction. Ned apologizes to Aronnax for striking him, but Aronnax concedes that the loss of his journal might have been for the best. As Nautilus sinks, Nemo's last words to Aronnax echo: "There is hope for the future. And when the world is ready for a new and better life, all this will someday come to pass... in God's good time."