Designer Edge Image of the Day – Bertha The World’s Largest Tunneling Machine
Kyle Maxey posted on August 06, 2013 | | 8147 views
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