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Q&A Expanding occupied underground habitations safely?

I have a colony of humans living underground in man-made catacombs on another planet. They are, essentially, digging/blasting as they go; they did not create a complete underground city first and ...

4 answers  ·  posted 10y ago by Monica Cellio‭  ·  last activity 9y ago by Monica Cellio‭

Question humans geology underground construction