Seattle Tunnel Partners | Tacoma Daily Index

Bertha, the world's largest tunneling machine, arrives in Seattle's Elliott Bay on April 2, 2013, following a 5,000-mile journey from Osaka, Japan. Crews will unload her 41 pieces (the largest weighing about 900 tons) and move them to the 80-foot-deep pit to the west of Seattle's stadiums, where Bertha will begin tunneling in summer 2013. (PHOTO COURTESY WASHINGTON STATE DEPARTMENT OF TRANSPORTATION)

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