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SR 99 tunnel boring machine launch pit construction | by WSDOT
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SR 99 tunnel boring machine launch pit construction

Crews build the launch pit for the State Route 99 tunnel boring machine in August 2012. The pit, just west of Seattle's stadiums, is where the world's largest-diameter TBM will be assembled and will start building the SR 99 tunnel.

 

Visit www.alaskanwayviaduct.org for more information.

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Taken on August 16, 2012