Tag: tunnel digger

Construction Equipment

Big Bertha, world’s largest tunnel-boring machine, lowered into starting position in Seattle

With the digging of the Washington State Route 99 tunnel in Seattle scheduled to start in July, the Washington State Department of Transportation recently lowered the head of Big Bertha, the world’s largest tunnel-boring machine, into the pit that will serve as its starting position. Bertha made her triumphant arrival in Seattle at the beginning of April […]

June 5, 2013