Seattle awaits arrival of world's largest tunnel-boring machine

08/31/2012 | PopularMechanics.com

An $80 million tunnel-boring machine being built in Japan for the Alaskan Way viaduct replacement project in Seattle will have more than 700 cutting tools on its face. The world's biggest borer, it will be used to carve a 57.4-foot-diameter tunnel. The machine could be delivered by the end of the year.

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