Do you believe that the earth we live in is hollow? and that there is another advanced civilization there?
Yes, the entrance is at Antarctica. You can watch the documentary here:
https://www.youtube.com/watch?v=JKPwtDjzJMIThat's some funny shit... tell me you don't take that seriously... Hitler riding a dinosaur in the hollow Earth? LMFAO
Also, google the word "documentary"... because this is definitely not a documentary
Sorry, my bad I forgot the BBcode.

[sarcasm]
I do belive in the hollow earth, and I know Hitler is riding on the back of a T-rex named Blondie and I also believe Sarah Palin is the president of the United States and she is a shapeshifting lizard btw.
[/sarcasm]