Do you believe that the earth we live in is hollow? and that there is another advanced civilization there?
Everyone has already answered your question, but there is something I noticed when reading about it. Ha ha ha
Where is hell? Guess what?
"Typically these traditions locate hell in another dimension or under the Earth's "
https://en.wikipedia.org/wiki/Hellha ha ha
That was an old christian belief... hence "The Divine Comedy"
https://en.wikipedia.org/wiki/Divine_ComedyHaving survived the depths of Hell, Dante and Virgil ascend out of the undergloom to the Mountain of Purgatory on the far side of the world