Hamartia Antidote
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TBM is certainly not new and I knew about it when I was in kindergarten, but building hundred subway lines in 40+ cities at the same time is something we have never seen before. The scale and the efficiency of China's infrastructure building are impressive, and I think that's the message OP tried to convey.
Seems Elon Musk thinks current TBM tech sucks. He wants to improve speed by 500 to 1000%.
http://www.dailymail.co.uk/sciencet...tweets-photo-giant-tunnel-boring-machine.html
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