Hollow Earth, What do you believe?

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I first met my boyfriend with him discussing Hollow Earth down to a tee and I would be lying if I said I wasn't at least a little intrigued. Its an interesting idea and in my opinion it could be possible. Its not like we know every single thing there is to know in the entire universe (although some may think that) so why rule out the possibility? Have you heard of these theories? Whats your stance on it?