Dominic Quesada and Johnny Gray, two SCUBA divers searching for sunken treasure off the coast of Cuba, think they\'ve hit the jackpot when they find a 17th century ship…
In 1868, rumors spread of a sea monster which attacks ships in the Pacific Ocean and disrupt shipping lanes. Professor Aronnax and his assistant, Conseil, board a U.S.…
Having previously survived being riddled with bullets, the Gill-man is captured and sent to the Ocean Harbor Oceanarium in Florida, where he is studied by animal…
A geology expedition in the Amazon uncovers fossilized evidence (a skeletal hand with webbed fingers) from the Devonian period that provides a direct link between land…
In the Florida Everglades, a pair of larger-than-human, intelligent leeches live in an underwater cave. They begin dragging locals down to their cave, where they slowly…
A nuclear submarine on maneuvers in the Pacific Ocean, captained by Commander Pete Mathews (Kenneth Tobey), comes into contact with a massive sonar return. The commander…
When the Japanese freighter Eiko-maru is destroyed near Odo Island, another ship—the Bingo-maru—is sent to investigate, only to meet the same fate with few survivors. A…
In the Salton Sea, an underwater earthquake causes a crevice to open, releasing prehistoric giant mollusks. A rescue training parachute jump is conducted, but the patrol…
Professor Millard Wyman (John Carradine) sends a crew of two men, Paul Whitmore (Allen Windsor) and Craig Randall (Robert Clarke), and two women Lauri Talbott (Sheila…
American tycoon George Harrison, his beautiful wife, Mona, and deep-sea diver Jeff Clark are off the coast of Africa hoping to salvage a fortune in diamonds at the…
A group of scientists and their support crew of five sailors land on a remote island in the Pacific Ocean. They are searching for a previous expedition that disappeared…
Far north of the Arctic Circle, a nuclear bomb test, dubbed "Operation Experiment", is conducted. Prophetically, right after the blast, physicist Thomas Nesbitt muses…
A delirious archaeologist stumbles into his group's camp without his partner, both of whom have been exploring a nearby cave. He quickly goes mad, requiring…