What Waits Below (1984)

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 cavedwellers who have apparently been isolated from the rest of the world for thousands of years The cavedwellers are hurt by radio frequencies and are able to see in infrared frequencies tracking the explorers by their body heat