Invasion From Inner Earth (1974)

aka’s: Hell Fire/They

A group of young pilots in a remote region of the Canadian wilderness begin to hear strange reports over their radios about planes crashing, cars stalling and a deadly plague which has gripped the planet. It becomes clear that Earth is in the midst of an invasion. The group of pilots decide to barricade themselves in a cabin deep in the woods and wait for their impending doom. With Paul Bentzen, Debbi Pick, Nick Holt, Karl Wallace, Robert Arkens and Arnold Didrickson.