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PHOTOS: Big Bertha’s 2,000-ton front end lifted to the surface. How the world’s largest tunneler was raised

PHOTOS: Big Bertha’s 2,000-ton front end lifted...

Posted by Wayne Grayson on Apr 01, 2015

After a year of slumber and almostĀ a month after chewing her way into a 12-story repair pit, Big Bertha, the ...

Camera gives a live view of construction on Big Bertha’s 12-story repair access pit

Camera gives a live view of construction on Big...

Posted by Wayne Grayson on May 13, 2014

Just because Big Bertha is down for nearly a year, that doesn't mean work around the world's largest tunnel boring ...

Before Bertha repairs begin, archaeologists will test soil for artifacts

Before Bertha repairs begin, archaeologists will test...

Posted by Wayne Grayson on Mar 25, 2014

Before workers in Seattle begin to dig a 12-story pit to make the necessary repairs to get the world's largest ...

Tunnel-boring machine Big Bertha shut down for “months” due to complexity of needed repairs

Tunnel-boring machine Big Bertha shut down for...

Posted by Wayne Grayson on Feb 11, 2014

Washington State Department of Transportation officials say Big Bertha, the world's largest tunnel-boring machine, is likely out of commission for ...

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