Some countries will build railways around those mountains, but if you’re Switzerland, and you have to deal with your Alps, you just go ahead and build the world’s largest tunnel even if it ...
The completed section of tunnel has a diameter of 55.8 feet (17 meters), and it has 500 pipe rings of underwater shielding.
Engineers at the China Railway Construction Heavy Industry Corporation (CRCHI) have turned to a 2,500-year-old blacksmithing approach to help build the world’s largest tunnel-boring machine (TBM).
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