The world’s largest tunneling machine, Bertha, is lowered into a pit at the start of the tunneling project under Seattle for an underground highway. The tunneling machine broke down and needs to be repaired. Crews began excavating to its site in mid-October and finally reached the bottom of the pit on Jan. 30.
The Washington Department of Transportation announced Jan. 30 that the 120-foot-deep tunneling machine repair pit in Seattle is complete.
Approximately 20,000 cubic yards of material was removed from the ground over the course of the excavation, which began in mid-October,...
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