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Rigorous Science Where would water come from in an underground colony?

A large solar flare event ignites the atmosphere of Earth, but luckily, humans have been preparing for an event like this for some time. We have a fairly large shelter around 2.2 kilometers undergr...

4 answers  ·  posted 9y ago by QuiquÈ…‭  ·  last activity 5y ago by QuiquÈ…‭

Question technology underground post-apocalypse survival