Seattle, tunnel, bore, dig, bertha, infrastructure, traffic, road

Under the city of Seattle, Bertha, the world’s largest tunneling machine is at work excavating what will soon become the 1.7-mile long SR99 tunnel.

At an astonishing five stories tall, and 326 foot long, Bertha represents a marvel of modern engineering. Once at full bore Bertha will be able to move 35 feet of earth a day. At that pace she’ll emerge from her subterranean home at the intersection of Sixth Avenue North and Harrison Street in around 14 months.

Watch a Video of Bertha in Action 

Image and Video Courtesy of WSDOT



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