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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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Members of the public sign one of the concrete segments that will form the future walls of the SR 99 Tunnel. The segment-signing was part of a July 20, 2013 public dedication ceremony for Bertha, the SR 99 tunneling machine.
Photo by WSDOT
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