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Adam's avatar

Edgar Rice Burroughs' "Pelucidar" series of adventure novels published (1914 through 1944) is also about the inner Earth. I happened to read those before discovering Bernard's "The Hollow Earth."

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Sindy's avatar

I believe that Davelis Cave ( Greece ), meets the "requirements" to be or have been an entry point to a hyperdimensional underground world...

- Nato has been present in a secret project to build more tunnels there.

- Many of the workers present in the construction of those tunnels suffered from cancer...

https://steemit.com/mystery/@eliakon/the-mystery-that-surrounds-davelis-cave

https://www.bbc.com/travel/article/20190228-athens-bizarre-underground-phenomenon

- More details in this video (in Italian) https://youtu.be/CzGQ5x8oK1Q?feature=shared

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