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.

"Bertha" the boring machine has a 57.5-foot diameter. The machine was designed to dig a two-mile-long highway tunnel. More from Tech 6 monster machines that are changing construction: #1 The ...

it is the largest tunnel-boring machine designed in China. The machine was built in Changsha, Hunan Province, through a ...

The machine is used in the construction of the Haitai Yangtze River Tunnel in East China's Jiangsu province. The tunnel is a ...

Gaur told PTI that the 9.69-m diameter Cabrera tunnel in Spain was built by a Double Shield tunnel boring machine at an average ... and experiments in tunnel construction that RVNL has undertaken ...

China on Wednesday deployed a giant self-developed tunnel boring machine (TBM) for the construction of the world's longest underwater highway TBM tunnel. The new machine, named "Jianghai," has a ...