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Becoming Bertha: The world's largest tunneling machine comes to life in Seattle (MPAC)

Wednesday, Dec 11, 2013 11:15a
Ivar's Salmon House Seattle, WA

(Note: this event Does Not include a site visit to the tunneling project site.) In summer 2013, Bertha, the world's largest tunneling machine, began a historic journey beneath downtown Seattle. Her purpose: dig a tunnel to replace the State Route (SR) 99 Alaskan Way Viaduct, the double-deck highway that has spanned the downtown waterfront for more than 60 years. Bertha's task sounds straightforward enough, but her background is complicated. What started out as a big machine has become something more… Show more

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