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There are already devices designed to melt the rock as it is being bored and use that molten rock to line the tunnel as the machine progresses. Not sure how tha
by arminiusreturns 7y ago
There are already devices designed to melt the rock as it is being bored and use that molten rock to line the tunnel as the machine progresses. Not sure how that would impact your statement about needing concrete, but thought I would share anyway.