More From world’s largest tunnel-boring machine

Washington governor halts Bertha tunneling after sinkhole forms

Washington governor halts Bertha tunneling after...

Posted by Bobby Atkinson on Jan 18, 2016

Bertha didn't get back to work for long. Washington Gov. Jay Inslee has put the brakes on the massive tunnel boring machine ...

Bertha breaks through repair wall and begins tunneling soil once more (VIDEO)

Bertha breaks through repair wall and begins tunneling...

Posted by Bobby Atkinson on Jan 13, 2016

It's taken two years in repairs and delays, but Bertha has broken through her concrete repair pit. The Washington State Department of Transportation ...

VIDEO: Bertha, world’s largest tunneler, resumes digging below Seattle after 2-year delay

VIDEO: Bertha, world’s largest tunneler, resumes...

Posted by Wayne Grayson on Dec 28, 2015

Though the contractor behind the Washington state Highway 99 project said it might give crews a holiday break before resuming the ...

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 ...

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 ...

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 ...

Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million

Water main damaged by Big Bertha repair excavation...

Posted by Wayne Grayson on Apr 14, 2015

Four months after crews temporarily stopped excavation on a repair pit for the world's largest tunnel-boring machine due to ground sinkage, ...

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 ...

VIDEO: Big Bertha breaks through: tunnel-boring machine enters repair pit, ready for disassembly

VIDEO: Big Bertha breaks through: tunnel-boring machine...

Posted by Wayne Grayson on Mar 09, 2015

Though she remains very far from being done, Big Bertha completed a very important leg in her journey beneath Seattle ...

Big Bertha wakes from one-year nap, begins to chew her way into repair pit

Big Bertha wakes from one-year nap, begins to chew her...

Posted by Wayne Grayson on Feb 19, 2015

For the first time in more than a year, Big Bertha actually bored. According to a report from the Seattle Times, the world's largest ...

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 ...

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