"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.
Rupert 'Wolf' Wolfsen

Major Elbert Stevens

Leslie Peterson

Frieda Shelley

Ben Gannon

Lt. George Barwell
Lemurian Elder

Hunter Prime

Santos Arias
Hector Lopez

Lemurian

Sgt. Neumann
Major Castillo
Hunter Second
Jim White

American Soldier
Mercenary
Mercenary
Lemurian
American Soldier
American Soldier

Lemurian (uncredited)