Bye-Bye to Bertha, the world’s largest tunneling machine

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This time-lapse video captures the difficult and challenging work to disassemble the world’s largest-diameter tunneling machine. For four months, crews cut, hoisted and trucked away 8,000 tons of the machine’s equipment and steel, removing it from inside the tunnel it had built. Up next – finishing the double-deck highway inside and installing all the operating systems to open Seattle’s new SR 99 tunnel by early 2019.


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