More From SR 99

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 ...

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 ...

No. 6 in 2013: Big Bertha digs in before being stopped in her tracks

No. 6 in 2013: Big Bertha digs in before being stopped...

Posted by Equipment World Staff on Dec 30, 2013

There's been a lot of excitement this year about the world's largest tunnel boring machine. Named "Big Bertha," she arrived ...

Unstoppable Force, Immovable Object: Seattle’s Big Bertha halted by mystery object

Unstoppable Force, Immovable Object: Seattle’s...

Posted by Wayne Grayson on Dec 19, 2013

Has Big Bertha met her match? She has, at least for the time being. The world's largest tunnel-boring machine was recently ...

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