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Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground

Drilling delays a problem for tunnel-boring machine Big...

Posted by Wayne Grayson on Jul 31, 2014

Crews in Seattle are now expected to finish digging a 12-story pit to reach stalled tunnel-boring machine Big Bertha one ...

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 ...

Lady Bird is installed below Washington D.C. before getting to work last year.

Lady Bird is the 1,300-ton tunnel-boring machine...

Posted by Wayne Grayson on Mar 19, 2014

Each year in Washington, D.C., about 2 billion gallons of raw sewage is dumped into the Potomac River, the Anacostia River ...

Repairs to Big Bertha will require a 12-story pit and removing the tunnel-boring machine’s cutterhead

Repairs to Big Bertha will require a 12-story pit and...

Posted by Wayne Grayson on Feb 28, 2014

Officials from the Washington State Department of Transportation have announced that in order to repair the world's largest tunnel-boring machine, ...

VIDEO: Baby Bertha? Bechtel builds mini tunnel-boring machine using 50,000 Legos

VIDEO: Baby Bertha? Bechtel builds mini tunnel-boring...

Posted by Wayne Grayson on Feb 10, 2014

The Lego Movie, which hit theaters this past weekend, is fantastic. But we wish the folks who made it had ...

Another mystery overheats, halts tunnel-boring machine Big Bertha once more

Another mystery overheats, halts tunnel-boring machine...

Posted by Wayne Grayson on Feb 04, 2014

The Washington State Department of Transportation officials in charge of the world's largest tunnel-boring machine have another mystery on their ...

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 ...

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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