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Oct 30, 2018 at 19:43 comment added Tim B @ThomasMyron You can't grow crops underground (at least not without advanced tech which by definition is not available).
Oct 30, 2018 at 18:47 comment added Thomas Reinstate Monica Myron What about underground cities/civilizations? If the Earth gets bombarded every X years, that seems like the logical place to go.
Oct 30, 2018 at 13:19 history answered Tim B CC BY-SA 4.0