More From tunnel-boring machines

Bertha is nearly ready to start tunneling again (VIDEO)

Bertha is nearly ready to start tunneling again (VIDEO)

Posted by Bobby Atkinson on Dec 17, 2015

The massive tunnel-boring machine that's been sidelined in Seattle for two years could be back to boring by New Year's. The ...

Bertha delayed again; won’t restart drilling until late December

Bertha delayed again; won’t restart drilling...

Posted by Bobby Atkinson on Oct 26, 2015

The Seattle Tunnel Partners have once again delayed the restart of drilling for the State Route 99 tunnel, with Bertha not expected ...

Crews prepare soil for Bertha to begin tunneling again

Crews prepare soil for Bertha to begin tunneling again

Posted by Bobby Atkinson on Oct 16, 2015

One of the last steps to getting Big Bertha back to boring beneath Seattle is underway. The Washington State Department of ...

Click through to see each step of Bertha's extensive repair process.

PHOTOS > Big Bertha gets her head together: How to...

Posted by Wayne Grayson on Sep 29, 2015

With the final repairs having been made earlier this summer and Big Bertha finally picked back together underground, Washington State ...

Stronger Big Bertha cutter head lowered back into its pit for tunneling

Stronger Big Bertha cutter head lowered back into its...

Posted by Bobby Atkinson on Aug 27, 2015

Big Bertha's massive cutter head is back underground after months of repairs were made to get the world's largest tunnel-boring ...

Big Bertha is set to start drilling again in November after extensive repairs, testing

Big Bertha is set to start drilling again in November...

Posted by Bobby Atkinson on Jul 21, 2015

The world's largest tunnel-boring machine is now scheduled to get back to work on November 23, nearly two years after it overheated ...

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

No. 8 Story in 2015 « No. 9 No. 7 »   The Big Bertha saga recently received a major update: crews ...

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 ...

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