Sound Transit Tunnel Boring Machine Hole-Through (September 2016)

Sound Transit contractors have completed mining the last tunnel segment for the Northgate Link Extension twin tunnels. Their tunnel boring machine has holed through the wall of a retrieval shaft at the University of Washington Station.
Sept. 6, 2016
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Sound Transit contractors have completed mining the last tunnel segment for the Northgate Link Extension twin tunnels. Their tunnel boring machine has holed through the wall of a retrieval shaft at the University of Washington Station.

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