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zardo
on Feb 16, 2017
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Elon Musk is boring a tunnel to skirt gridlock
If you're already on top of caverns, the tunnels might actually be able to stabilize and reinforce the ground. In theory... the actual digging would undoubtedly be complicated by caverns.
WorldMaker
on Feb 16, 2017
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It is just unfortunate that the caverns naturally created by water erosion so rarely correspond to interesting or useful transportation corridors. :)
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