Hollow earth

Owen Egerton's 2017 book Hollow used the theory to tell its story. Now that conspiracies are everywhere, he's reconsidering that move.

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The two known entrances to Inner Earth (The South Pole and North Pole) of course there are multiple entrances (some being in Africa, Germany and possibly, New Mexico.

Beliefs in mysterious underworlds are as old as humanity. But the idea that the earth has a hollow interior was first proposed as a scientific theory in 1691 by Sir Edmond Halley (of comet fame), who suggested that there might be life down there as well.

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In February, 1947, Rear Admiral Richard E. Byrd, leading a United States Navy Task Force expedition, flew for seven hours beyond the North Pole and

Look into the ground of hollow earth