Two explorers from the Earth's surface had carved themselves an empire at the Earth's core - Pellucidar.
The dangers were many. Untamed tribes and vicious beasts were a constant peril, and there were times when the lives of the surface-men were at stake. But, just when things seemed hopeless, they came up with a trump card - a new weapon.
What they didn't realize was that it was a weapon that could bring its makers to the brink of disaster.
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