It looks as if Seattle Tunnel Partners will dig a giant shaft in front of Bertha, the tunneling machine stuck under downtown Seattle's waterfront, to make repairs and ...
Gunpowder was first used in 1679, to build an underground section of the Canal du Midi, a canal connecting the Atlantic Ocean and the Mediterranean Sea. The tunnel was 157 meters long. Nitroglycerin ...
A hydrogen-powered digger has been used on the Lower Thames Crossing in a world-first live deployment, as National Highways pledged that the road tunnel ...
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