Bertha, the massive tunnel-boring machine being used to drill a two-mile tunnel in Seattle, is shown in July 2013.
Bertha, the massive tunnel-boring machine being used to drill a two-mile tunnel in Seattle, is shown in July 2013. Ted S. Warren The Associated Press
Bertha, the massive tunnel-boring machine being used to drill a two-mile tunnel in Seattle, is shown in July 2013. Ted S. Warren The Associated Press

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