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Last day above ground for Bertha's cutterhead | by WSDOT
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Last day above ground for Bertha's cutterhead

Suspended from a towering gantry crane, the SR 99 tunneling machine’s 57.5-foot-diameter cutterhead hangs for its last hours above ground before being lowered into the launch pit. The machine, known as Bertha, arrived in Seattle in April 2013 and will begin digging the new SR 99 tunnel in summer 2013. 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 May 31, 2013