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Bertha hits the wall | by WSDOT
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Bertha hits the wall

Bertha, the world’s largest tunneling machine, got her first taste of tunneling on July 30, 2013, officially starting the 2-mile journey beneath downtown. Learn more about the Alaskan Way Viaduct Replacement Program at www.alaskanwayviaduct.org or follow Bertha on Twitter @BerthaDigsSR99.

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Taken on July 30, 2013