There is a theory that an ancient civilization is living in the inner center of the Earth. It is believed that this civilization lives in so-called hollow cavities which were formed naturally below the surface of the crust. David Wilcock revealed that "What this means is that you can actually live inside caverns in the Earth that have visible light," he marveled. Wilcock stated that based on his research, it seems as if these cavities are utilized so that advanced civilizations have a place they can live while looking out for everything that happens on the 'outer Earth', the surface of the planet. Wilcock firmly believes that during the long history of our planet, numerous advanced civilizations like the Atlanteans went underground in order to survive the chaotic times ruling over the surface of our planet. Eventually, they decided to settle down in their new subterranean habitat. The existence of underground tunnels and passageways has been a subject of debate for centuries. Ancient