Video: Underground Civilisations – Ancient Man-made tunnels

Video Underground Civilisations - Ancient Man-made tunnels
Video Underground Civilisations - Ancient Man-made tunnels

[dropcap]Could[/dropcap] there really be vast open spaces within the Earth where advanced civilisations live? If we were visited in the ancient past, could they have hidden the evidence deep within these tunnels? Perhaps we have only scratched the surface of our planets underground mysteries… and maybe there is more, much more to be found.

http://youtu.be/U7xLERSRpYQ