WSDOT officials check out deep-bore tunnel machine in Japan

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by KING 5 News

KING5.com

Posted on December 21, 2012 at 12:38 PM

Updated Friday, Dec 21 at 12:38 PM

Officials from the Washington State Department of Transportation were in Osaka, Japan, on Thursday  to witness testing of the world's largest-diameter tunnel boring machine. Named Bertha, the five-story-tall machine will be shipped to Seattle to dig the tunnel that will replace the waterfront section of the SR 99 Alaskan Way Viaduct.

Watch the video above.

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