At the Earth's Core

A Victorian era scientist and his assistant take a test run in their Iron Mole drilling machine and end up in a strange underground labyrinth ruled by a species of giant telepathic bird and full of prehistoric monsters and cavemen.

At the Earth's Core is a 1976 adventure fantasy movie directed by Kevin Connor, starring Peter Cushing, Cy Grant, Doug McClure. It holds an IMDb rating of 5.1/10 from 6,147 votes and runs 1h 29m.