This idea might even have legs. Remember all the old 50s & 60s SF stories of buried science cities built to survive nuclear wars? Unlike space colonies, a group of sufficiently dedicated & idealistic crazy geeks with a goodly wad of cash could likely build such a thing right now and make it self-sufficient (using nutrients and other raw materials in the rocks, and water filtered through a deep aquifer for drinking and to split for oxygen to supplement the plant). Geothermal power could provide all the power they'd need. Hmm, I wonder if someone could get rich persuading crazy geeks to invest in "survival caverns". Also, if it worked, in a couple centuries the post-humans living on the surface could amuse themselves by sending nano-probes down to watch the cannibalistic mole people survivors. It sounds like a win-win situation to me.
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dedicated & idealisticcrazy geeks with a goodly wad of cash could likely build such a thing right now and make it self-sufficient (using nutrients and other raw materials in the rocks, and water filtered through a deep aquifer for drinking and to split for oxygen to supplement the plant). Geothermal power could provide all the power they'd need. Hmm, I wonder if someone could get rich persuading crazy geeks to invest in "survival caverns". Also, if it worked, in a couple centuries the post-humans living on the surface could amuse themselves by sending nano-probes down to watch the cannibalistic mole people survivors. It sounds like a win-win situation to me.