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00000181-fa79-da89-a38d-fb7f2a000000Bertha, the world's biggest tunneling machine, is a five-story-tall monstrosity of drilling tasked with digging out the tunnel for State Route 99 to replace the Alaskan Way Viaduct. It's journey to the center of the earth underneath downtown Seattle began in July 2013, and since then the project has seen its fair share of successes and failures.Follow the progress of the $3 billion megaproject with KUOW.

Who Pays For Bertha's Delays?

Two workers walk through the first rings of the tunnel toward Bertha, the SR 99 tunneling machine.
Flickr Photo/WSDOT (CC-BY-NC-ND)
Two workers walk through the first rings of the tunnel toward Bertha, the SR 99 tunneling machine.

Ross Reynolds talks to Lynn Peterson, secretary of the Washington State Department of Transportation, about delays to the Seattle tunnel project to replace the Alaskan Way Viaduct.

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