Invasion from Inner Earth

Invasion from Inner Earth 1974 is an apocalyptic science fiction film, starring Paul Bentzen and Debbi Pick. The film was directed by Bill Rebane, the same director of Monster A GoGo 1965, and The Giant Spider Invasion 1975. The film, also known as Hell Fire and They, was inspired by the British film The Strange World of Planet X 1957, and filmed in the style of thrillers directed by Alfred Hitchcock.

Source: Wikipedia