An curved arrow pointing right. When Seattle decided to put in a new highway tunnel beneath the city, a machine was specially built to dig the 2-mile long, 57-foot wide project. The 6,700 ton ...

Move aside, earth beneath Seattle. Here comes some hard rock. Seattle Public Utilities has announced that a tunnel boring machine that will be used to carve a path for the… Read More Mudhoney?

A portion of Seattle's Alaskan Way Viaduct is being replaced by a deep tunnel, and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha." ...

On April 17, Mary the Tunnel Boring Machine emerged through the headwall ... the third of its kind in the U.S. (The other two ...