J. Ernest Williamson

Captain Nemo has built a fantastic submarine for his mission of revenge. He has traveled over 20,000 leagues in search of Charles Denver - a man who caused the death of Princess Daaker. Seeing what he had done, Denver took the daughter to his yacht and sailed away.

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.

Directed by Carl Gregory.

A poor but brilliant inventor sets out to make his fortune by discovering buried treasure, with the aid of a special inverted periscope through which he can view the ocean floor.

The ocean depths are explored with the aid of a submarine chamber of Williamson's invention and a few hardy souls. The construction of the device is examined; but most of the footage is given to plant and animal life, a girl swimming among the coral growths, and two divers who encounter a moray and an octopus.

Stephen Verrill dies, leaving the deed to a valuable gold mine to his wife and child. Verrill's widow, planning to establish a company to operate the mine, sails aboard the steamer Caribee bound for New York. With the aid of Allen, the mate, Cuttle, a notorious trader, scuttles the ship on a wild coastline. As the lifeboat drifts towards a small island, it is overturned by a giant octopus, and the baby is washed ashore, the mine deed tied to her neck.

Olive Granger, an heiress survives a shipwreck in the South Seas and is washed ashore an island along with international crooks Irene Carlton and Fred Morgan, who steal her credentials and escape to America, where Irene poses as Olive. Paul Patterson and Jan Boomer, divers, find Olive abandoned in a cave and fight through the jungle in competition for the girl. While diving for pearls, the treacherous Boomer dies in the clutching coils of a giant octopus. Olive and Paul arrive in New York, expose the impostors, and get married.