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Bertha tunneling machine
Bertha will soon begin digging below the viaduct its path will replace
The world's largest tunneling machine will soon begin its dig beneath the Alaskan Way Viaduct in Seattle, its first activity ...
Bertha back to drilling after suspension is “conditionally lifted”
Bertha hasn't been blessed with the best of luck in Seattle, but the world's largest tunnel boring machine is back to drilling ...
Washington governor halts Bertha tunneling after sinkhole forms
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)
It's taken two years in repairs and delays, but Bertha has broken through her concrete repair pit. The Washington State Department of Transportation ...
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VIDEO: Bertha, world’s largest tunneler, resumes digging below Seattle after 2-year delay
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)
The massive tunnel-boring machine that's been sidelined in Seattle for two years could be back to boring by New Year's. The ...
Big Bertha, world’s largest tunnel-boring machine, arrives in Seattle
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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