The Seattle Times

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BETTINA HANSEN / The Seattle Times
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Wednesday, August 28, 2013

Huge tunneling machine off to painfully slow start

An Aug. 13 aerial view of the site where tunnel-boring machine Bertha is at work shows that progress has been slow since digging began on July 30. According to the state Department of Transportation website, the machine was slowed by a 15-foot-thick wall of concrete, which it broke through last week.