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If you kindly use the search function on here, you'll find some information on the hollow earth theory. That should give you some idea of what people are discussing, etc.
Therefore, all we have to rely on is second-hand information from those who have been to those areas. It's not too reliable though but it's all that there is right now.
Originally posted by The Sword
reply to post by spikey
Is it possible that they were sworn to secrecy or signed a contract/waiver?
I imagine that if someone had broken protocol, we would probably never hear from them again.