At the Earth's Core

When absentminded Dr. Abner Perry (Peter Cushing) and his young American protégé, macho David Innes (Doug McClure), develop the Iron Mole, a contraption that cuts straight through solid rock, they have no idea what they're letting themselves in for in this campy sci-fi fantasy. The two bore their way from Victorian England to the center of the Earth, where they encounter a lost world of prehistoric beasts and their human slaves.