More From Washington State Route 99 tunnel

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 ...

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 ...

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 ...

Big Bertha, world’s largest tunnel-boring machine, lowered into starting position in Seattle

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

Posted by Wayne Grayson on Jun 05, 2013

With the digging of the Washington State Route 99 tunnel in Seattle scheduled to start in July, the Washington State Department of ...

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