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WSDOT: Building a Highway Underneath Seattle

Posted by Infra on Tuesday, December 20th, 2016

With a time-lapse camera mounted 54-feet high, you almost get a bird’s-eye view of work inside Seattle’s SR 99 tunnel. As the tunneling machine Bertha builds the tunnel, road crews are right behind – building the foundations, walls and the top deck of the double-deck highway drivers will travel on when the tunnel opens. Take a look.

wsdot on YouTube

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