I would venture to say that some of the people who believe in an 
Underworld with unknown civilizations picture things not so much as a 
hollow sphere with a sun in the middle, but more like the interior of 
the earth (or perhaps the outer mile or so of the crust) being riddled 
with caverns of varying size, some large enough to harbor large 
communities of perhaps thousands of residents.

 From the viewpoint of physics this is actually quite plausible.  There 
are large cave systems in various places around the world, generally 
where there has been no recent seismic activity to speak of.

Of course, the true believers have a ready explanation for why the 
surface people are unaware of what dwells beneath us, and usually the 
explanation involved the untimely demise of everyone who ventures into 
the inhabited portions of the chthonian realm.  Readers of H.P. 
Lovecraft are familiar with this.

Regards,
John

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