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Q&A How thick should the roof of a large cave be to safely build a city on top of it?

Fullmetal Alchemist (2003) features a giant (and I mean stupidly big) cave under a large and busy metropolis. Nobody is aware of its existence, which means that at least since the city's founding (...

3 answers  ·  posted 7y ago by Notiophilus‭  ·  last activity 7y ago by Notiophilus‭

Question caves geology underground