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Something Called "The Object" Stops World's Largest Tunneling ... Bertha, the world's largest tunneling machine, churning through the rock and mud beneath Seattle, has hit a mysterious roadblock—so mysterious, it is only known Online Services

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Big Bertha's Two-Mile Subterranean Journey Is Almost Over More than 150 feet below the streets of Seattle, Bertha presses on, ... Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the ...

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It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. ... Bertha resumed tunneling on Friday, April 29, 2016, and crossed 15 feet (4.6 m) under the closed viaduct in a 11-day closure in ...

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