'Bertha' Does The Heavy Lifting In Seattle Tunnel Project
By: Martin Kaste
May 6, 2013
The world's largest tunnel boring machine in a few months will begin digging a new double-decker highway tunnel under downtown Seattle. If all goes according to plan, Bertha will start digging this summer. It'll emerge again late next year on the other side of downtown, not far from the Space Needle.
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