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And The Gap was founded in 1969. Coincidence? I think not.
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Not ideal, also not easily and quickly accessible to populated areas in almost all cases (salt mines bear Cleveland maybe)
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Also no one excavates a mine to be able to be sealed off to the outside world, quite the opposite
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Play a big role in various scifi books and species survival. See https://www.amazon.com/2312-Kim-Stanley-Robinson/dp/0316098116 …
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Could we send the planners of this to the mine shafts in Centralia?
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