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  • Massive 'launch pit' dug for Seattle tunnel boring machineadd to reading list  

    Posted on August 23, 2012 at 8:38 AM

    Crews have 6 months to finish a massive pit at the south end of the Alaskan Way viaduct. That's when the world's largest boring machine will arrive and start digging the tunnel.

    By KING 5 News

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