Dr. Abner Perry, a British Victorian scientist, and his US financier David Innes make a test run of their Iron Mole drilling machine in a Welsh mountain.

While drilling underground, the extreme heat emanating from the magma around the Mole knocks the duo out and makes them temporarily lose control over where the machine is taking them.

After it passes through the magma crust and gets closer to the Earth's core, the temperature inside the Mole starts to lower, and the duo regains consciousness.

The Mahars send a giant dinosaur to kill the duo, but with the help of Perry (who shouts about the creature's weak point from the crowd), David and Ra survive.

[11] The New York Times wrote: "All the money used to make 'At the Earth's Core' seems to have been spent on building monsters with parrotlike beaks that open, close, and emit a steady squawling as if someone were vacuuming next door.

Close up, the monsters look like sections of rough concrete wall and the decision to film them in closeup is only one example of the total lack of talent or effort with which the picture is made ... the movie is a kind of no-talent competition in which the acting, the script, the direction and the camera-work vie for last place.