The hollow Earth theory holds that Earth is not a solid sphere but is hollow and has openings at the poles. Furthermore, an advanced civilization, the Agartha, exists within Earth. Their people include advanced spiritual and technological masters who sometimes foray into the atmosphere in their UFOs. In the late 17th century, British astronomer Edmund Halley proposed that Earth consists of four concentric spheres and also suggested that the interior of the Earth was populated with life and lit […] Read More