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…
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…
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 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…
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…
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 young and reckless criminal, Jim (Don Durant), stows away on his brother Chris Johnston's (Bill Cord) boat after killing two men interrupting his gun running. As they…
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…