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
Tags: Bertha, Seattle, SR 99, Video, WA, Washington, Washington State Department of Transportation, WSDOT, YouTube