big bertha

Seattle Drilling
11:15 am
Wed April 30, 2014

Tunnel Machine Set To Dig Under Seattle -- But It's Not Bertha

A tunnel machine is set to resume digging beneath the streets of Seattle in June. This machine isn't named Bertha.

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SR 99 Tunnel
5:57 pm
Fri January 3, 2014

SR 99 Tunnel Making Machine Bertha Blocked by Pipe

Big Bertha is halted by a metal pipe.
Credit WADOT

Experts say a steel pipe is at least partly to blame for halting a massive tunnel-boring machine beneath downtown Seattle. The state Department of Transportation said today (Friday) that an 8-inch-diameter pipe was discovered protruding through an opening in the machine's cutter-head. Officials say the pipe is a well casing installed by the department in 2002 to monitor groundwater. Chris Dixon is the Seattle Tunnel Partners Project Manager.  “A cutter head won't line through and cut up steels.  Very good with clay and sands and boulders and gravels but …not good with metal.” He said.

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Alaskan Way Viaduct
4:04 pm
Tue September 17, 2013

Inslee Says 'Big Bertha' To Resume Drilling Seattle Tunnel

WSDOT

Originally published on Tue September 17, 2013 4:44 pm

"Big Bertha" should soon get back to work digging a nearly two mile tunnel to replace Seattle’s Alaskan Way Viaduct.

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