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Why Isn't Bertha Moving?

caption: Bertha, the world’s biggest tunnel boring machine, has been stuck under Seattle since Dec. 6, 2013.
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Bertha, the world’s biggest tunnel boring machine, has been stuck under Seattle since Dec. 6, 2013.
Flickr Photo/Washington State Department of Transportation

David Hyde talks with Mike Lindblom, Seattle Times transportation reporter, about why Bertha hasn't moved since December.

Bertha is the world’s biggest tunnel boring machine that has been charged with digging out the replacement path for the Alaskan Way Viaduct under Seattle.

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