Seattle Tunnel Boring Machine Underperforms After One Month
Construction Equipment
AUGUST 29, 2013
Bertha, the tunnel boring machine excavating Seattleās Highway 99 tunnel, has traveled only 24 feet in its one month of operation, according to the Seattle Times. mile tunnel, as the machine was originally estimated to move 6 feet per day at the beginning, and 35 feet per day under the downtown area.'
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