A rabbi told me that ancient Kabbalistic texts suggest that the Garden of Eden is located in the center of the earth and the earth is hollow. (When Adam and Eve were expelled from the Garden of Eden, they were expelled to the outer earth.) Not only this, but the inner earth is not Euclidean as we would normally picture it. In layman's terms, "The inner earth is in another dimension."
As we know, this sentiment goes against the modern science.
But let's suppose that the earth were hollow and the inner earth were "in another dimension". What would the possible topologies of such an inner earth look like?