More From SR 99 tunnel

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 ...

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 ...

Excavation stopped on Big Bertha repair pit due to major ground sinkage in area

Excavation stopped on Big Bertha repair pit due to...

Posted by Wayne Grayson on Dec 15, 2014

The latest in a long string of delays to affect tunnel-boring machine Big Bertha has far greater implications than any of the ...

Repairs to Big Bertha will include 86 tons of steel reinforcement to tunnel-boring machine’s bearing, cutter drive

Repairs to Big Bertha will include 86 tons of steel...

Posted by Wayne Grayson on Jun 18, 2014

The largest tunnel-boring machine in the world needs a bit of reinforcement against the "wet and abrasive soils" deep below ...

Big Bertha, world’s largest tunnel-boring machine, arrives in Seattle

Big Bertha, world’s largest tunnel-boring...

Posted by Wayne Grayson on Apr 04, 2013

The "Big" in Bertha's name isn't there for the catchiness. It's there because it's apt. With a 57-foot diameter and a ...

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