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Boring the Seattle Tunnel

The City of Seattle says farewell to Bertha as she starts her journey burrowing for over a year under Seattle's streets.

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Tunneling crews discuss their progress as they operate Bertha, the world's largest tunneling machine, in November 2013. Inch-by-inch progress data is collected and analyzed by dozens of monitors on the 57.5-foot-diameter machine as it tunnels its way beneath Seattle.
Photo by (WSDOT)
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