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

    Posted on August 22, 2012 at 6:13 PM

    Updated Thursday, Aug 23 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.

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