Plot:
Stock footage of an A-bomb detonation allows the narrator to ominously inform us about the atomic age.

Leave Ray Palmer alone, he'd never hurt you...
Dr. Jeremiah Morley is warning the world that nuclear weapons could destroy the world. He develops a plan to save society by
searching underground to find an area that could be used to protect humanity. He presents his plan to various potential
benefactors which who refuse to help.
Morley’s group is contacted by Thompson, a newspaper mogul, who agrees to finance the project provided he gets to go
with them.
The scientists take the cyclotram, the underground drilling vehicle.

Good thing the depth detector has a televison channel dial.
They drive it into a dead volcano. After a few hours, the group leaves the vehicle to go out for a hike.
Thompson learns the scientists and the engineers aren’t impressed with him because he’s not as devoted to the project
like they are. In a cavern, they find the best place to blast through to keep going.
They keep hiking with the cyclotram keeping up the rear. Suddenly, they find an area with fresh air? Heading on, we get
scientific rant about limestone cavern formation.
Later, the group argues why they’re feeling lonely.

We can't believe the new Knight Rider is truly that awful...
Paxton, a scientist, thinks they only need 1 leader and the rest are sheep
to follow. Paxton and Coleman head on ahead. The others find a gas leak and find their associates’ corpses.
AT 110 miles down, they keep trucking to 240 miles down. The trouble is they can’t find any water.

Quit trying to milk stalactites..
With running low on supplies, they’re able to hear running water behind a wall. Breaking into it lets a steam vent loose. The
condensed steam solves the water problem. Debating what to do, they vote to go on: 3 to 2.
Thompson tries to romance Dr. Joan. Adam, the engineer, tries picking a fight with Thompson. Things calm down.
Heading on, the cyclotram goes into a lake and discover some eyeless fish. Morley thinks this is the best place. Exploring around
the area, more Thompson and Adam fussing ensues. Adam falls down a cliff, Thompson reaches but isn’t able to rescue him.
Thompson is now sure to go on. They find a lit area with a waterfall, sea, and sunless light from reflected phosphorous, 1600 miles
below.

I knew I should have taken that right turn at Albuquerque...
Morley is sure that everything is good.
The scientists want to see how rabbits will react to the area to demonstrate how humans will. Joan discovers the rabbit’s babies
are born sterile. At best, they could stay in the area for 1 generation. Morley wants to stay.
Suddenly, a volcano erupts and the natural disasters ensue. Thompson, Joan, the other guy reach the cyclotram, but Morley
wanders away. The cyclotram is pulled down. The crew realizes they’re lost when suddenly they start to pull up? They reach the
ocean’s surface and spot a nearby island.