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Seattle, WA: Bertha Breaks Through

Posted by Infra on Friday, April 7th, 2017

The SR 99 tunneling machine, Bertha, breaks through to daylight on April 4, 2017 near Seattle’s iconic Space Needle after tunneling 1.7 miles underneath downtown Seattle. See what one of the world’s largest tunneling machines looks like up close as only a drone can show.

wsdot on YouTube

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