Subterranean Worlds Inside Earth

Is the earth hollow? Is our planet honeycombed with caverns inhabited by a mysterious race? Are there civilisations of super beings living beneath the surface of the earth? Are the residents of this subsurface world friendly, or do they have our domination in mind? Here are strange and unexplainable legends of the 'Wee People' the Dero, and long-haired Atlantean giants as encountered by cave explorers, and miners trapped beneath the earth.