Underground, no-one can hear you die!
The US military is running a test for a special type of radio transmitter, to be used to communicate with submarines, in a deep system of underground caves in Central America. When the signal from one of the transmitters suddenly disappears, a team of soldiers led by Major Elbert Stevens and cave specialists led by Rupert 'Wolf' Wolfsen including scientist Leslie Peterson are sent in to find out what happened. Exploring deep underground, they stumble upon a tribe of albino cave-dwellers who have apparently been isolated from the rest of the world for thousands of years. The cave-dwellers are hurt by radio frequencies and are able to see in infra-red frequencies, tracking the explorers by their body heat.
Producer: Sandy Howard, Robert D. Bailey
Director: Don Sharp
Story: Freddie Francis
Screenplay: Robert Vincent O'Neil, Christy Marx
Director of Photography: Virgil L. Harper
Rupert 'Wolf' Wolfsen
Major Elbert Stevens
Leslie Peterson
Frieda Shelley
Ben Gannon
Lt. George Barwell
Lemurian Elder
Hunter Prime
Secrets of the Phantom Caverns (1985) Roadshow Home Video Australia Trailer