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A comment on Elon Musk’s Boring Co. Wins Chicago Airport High-Speed Train Bid. Parent comment
The small-diameter tunnels we're talking about were built with a tunnel shield, which is the hand-operated predecessor to the TBM.
https://en.wikipedia.org/wiki/History_of_the_London_Undergro...
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The small-diameter tunnels we're talking about were built with a tunnel shield, which is the hand-operated predecessor to the TBM.
https://en.wikipedia.org/wiki/History_of_the_London_Undergro...