More From tunnel-boring machines

Crews begin installation of Big Bertha’s new seal system

Crews begin installation of Big Bertha’s new seal...

Posted by Wayne Grayson on Jun 16, 2015

While the rest of her massive frame waits below ground, Big Bertha has undergone the most pivotal portion of her ...

Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall

Board rules WSDOT should have given contractor more...

Posted by Wayne Grayson on May 12, 2015

In regard to the drilling of the new State Route 99 tunnel below Seattle, the Washington State Department of Transportation ...

Did Seattle’s SR 99 tunnel really require Big Bertha? Indeco argues breakers are the answer

Did Seattle’s SR 99 tunnel really require Big Bertha?...

Posted by Marcia Gruver Doyle on Apr 23, 2015

  Tunnel boring machines such as Big Bertha, the 7,000-ton machine sidelined after a massive fail under the streets of Seattle, ...

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 almost a month after chewing her way into a 12-story repair pit, Big Bertha, the ...

Crews reach the end of digging a 120-foot repair pit Bertha will chew her way into.

PHOTOS: Fixing Bertha: How workers dug a 12-story pit...

Posted by Wayne Grayson on Feb 11, 2015

The Big Bertha saga recently received a major update: crews with lead contractor Seattle Tunnel Partners have finished digging the ...

Big Bertha’s delays have pushed back the opening of the tunnel it’s digging by 20 months…so far

Big Bertha’s delays have pushed back the opening...

Posted by Wayne Grayson on Dec 24, 2014

Seattle's new State Route 99 tunnel is officially 20 months behind schedule, and it's all Bertha's fault. The Associated Press reports ...

VIDEO: Watch construction crews bore and blast below New York City to build the 2nd Avenue subway line

VIDEO: Watch construction crews bore and blast below...

Posted by Wayne Grayson on Oct 22, 2014

"New York City is one of the toughest places to build anything." That quote from NYC subway train service supervisor Bill ...

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 ...

PHOTOS: Amazing images of subway construction in the man-made caverns below New York City

PHOTOS: Amazing images of subway construction in the...

Posted by Wayne Grayson on Apr 07, 2014

Back in June we showed you a handful of pictures from deep below New York City. And while they depicted ...

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 ...

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, ...

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