>I'd begin to worry about going sufficiently down in New Avalon, as a
>sufficiency of 'down' becomes 'out' at some point...

Well... yes, I suppose so, but since the pseudocontinent's lithoplate averages 25 miles in thickness, "out" would happen at roughly the point at which you would reach the Mohorovičić discontinuity on a continent of a typical tectonically active terrestrial planet. This is... not really a matter of practical concern, particularly as you wouldn't actually get out, you'd just hit neutronium* and, presumably, have to stop digging. :)

--G.
* YES I KNOW CAN WE NOT HAVE THIS CONVERSATION AGAIN EVERYONE
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Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
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