I do not know what to make out of this Hollow Earth theory, but i started believing that never rely on mainstream science for verification of any theory as i watch mainstream science every day fighting with its own contradictions and increasing the lists of anomalies. For hollow earth, it is well documented fact that Nazis funded expeditions in Tibet in Third Reich; and why Nazis were in Tibet and what they were doing; the mythical stories of Agartha/Shambala may be found in following sources, if you are interested in reading them (they may be found at
www.scribd.com):
On Edward Bulwer-Lytton: Agharta, Shambhala, Vril and the Occult Roots of Nazi Power by Joseph George Caldwell
Allied Union, Thule Gesellschaft and the Vril Society by Wes Penre
The Coming Race by Edward Bulwer-Lytton
The Invisible Eagle by Alan Baker
and there are some interesting videos about this underground civilization, which seems to have the key to our future, especially in 2012 scenario....
http://www.youtube.com/watch?v=1ELtO...eature=related
I think our past may hold the key to our future; however we do have an critical eye to evaluate all the information available...
Thanks & Regards
The Rebel