More From what stopped big Bertha

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 ...

Tunnel-boring machine Big Bertha moves forward 2 feet in test run to see if blockage is fully removed

Tunnel-boring machine Big Bertha moves forward 2 feet...

Posted by Wayne Grayson on Jan 31, 2014

After nearly two months of downtime caused by a steel pipe stuck in her teeth, Big Bertha, the world's largest ...

A steel pipe is what brought Big Bertha, the world’s largest tunnel-boring machine, to a halt

A steel pipe is what brought Big Bertha, the...

Posted by Wayne Grayson on Jan 06, 2014

The mystery is solved—in part at least. After Big Bertha, the world's largest tunnel-boring machine, was brought to an abrupt halt ...

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