It is FAR easier to hold up a mass via tension from above than to push it up via compression from below. So cities in huge underground caves can be MUCH taller if they hang from the cave ceiling, relative to pushing up from the cave floor.
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also, I'm a bit spergy re tunnels - spent several years writing my Great Libertarian Science Fiction Novels which revolve around tunnel boring machines, etc.https://www.amazon.com/dp/B005JPPMS6
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So do you know a physics limit on cave size?
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