Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.

CHANGSHA -- China's self-developed tunnel boring machine with the biggest diameter ... which is intended to establish a major trans-river road link under the country's longest river, connecting ...

A 1,600-tonne tunnel boring machine has made it halfway through its journey to build the 3.5 mile (5.6km) Bromford Tunnel between Water Orton and Washwood Heath. Working about 40m (131ft ...

when he tweeted that he was fed up with LA traffic and would "build a tunnel boring machine". The proposed route is from the headquarters of Musk's company SpaceX in Hawthorne to West Los Angeles ...