Admiral Byrd apparently met with humanoid aliens on his antarctic expedition in the early 20th century.He went off the radar and was missing for a few days then he returned as time had passed differently and the place he ventured to was like a paradise.
Hollow earth links to vids.
http://www.youtube.com/watch?v=uIRdD...eature=related
http://www.youtube.com/watch?v=9g-T6...eature=related
Some say there exists our ancestor races and blue skinned entities like those of mu and lemuria underground-it's a very extensive study;there are tales of people seeing creatures approaching humans from caves that lead deep underground and sometimes never to return!