Removing A Tunneling Machine From The Ground Is Strangely Difficult
https://www-newz.blogspot.com/2015/02/removing-tunneling-machine-from-ground.html
Tunnel-boring machines are genuine marvels of modern technology — self-contained contraptions big enough to build entire subway tunnels, a job that used to require thousands of pick-axes and the sacrifice of quite a few lives. But once construction is finished, getting the machines out can take months.
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