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.

Cast:Lionel Barrymore, Jacqueline Gadsden, Lloyd Hughes, Montagu Love, Montagu Love, Snitz Edwards,

Genre:Adventure, Science Fiction, Action, Drama, Fantasy, Horror,

country:United States of America,

Production:Metro-Goldwyn-Mayer,