Hollow Earth theories posit that the planet Earth has a hollow interior and, possibly, a habitable inner surface. At one time, adventure literature made this idea popular, and it was a feature of many fantasy and science fiction works as well as some conspiracy theories. People have never drilled into the Earth deeper than 15 miles, and thus direct knowledge of the Earth's structure extends only that far. However, the hypothesis of a Hollow Earth has long been contradicted by overwhelming evidence as well as by modern understanding of planet formation, and the scientific community now dismisses the notion as pseudoscience. Hollow Earth claims Conventional hollow Earths Early history In ancient times, the idea of subterranean realms seemed arguable, and became intertwined with the concept of "places" such as the Greek Hades, the Nordic svartalfheim, the Jewish Sheol, and the Christian Hell. Also Plato is considered as the

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