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    Bertha, the huge machine currently boring a two-mile tunnel 200 feet beneath Seattle, returned to work this week after surveyors discovered that it was "several inches" off course.

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    Gizmag goes inside the world's largest tunnel boring machine By David Szondy July 22, 2013 Map of the SR 99 tunnel (Image: WSDOT)

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    World News Brief - TunnelTalk.com. May 08, 2018 - Santa Clara Valley Water District commits $650 million to WaterFix The Mercury News May 07, 2018 - Pune to proceed with plans for water tunnel The Times of …

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