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by uboot
720 days ago
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There is a limit, but it is rather high. The big constraint is the steel cladding of the shafts --- those nearly vertical tunnels are all "armored", because normal rock would not resist the pressure. The company I work for has plants with 800m ~ 2400 feet height difference running, I know of slightly higher ones in the French/Swiss Alps. Up to 1km is doable with current engineering. |
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