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big bertha tunnel boring machine run 24 hours aday

Bertha (tunnel boring machine) - Wikipedia

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big bertha tunnel boring machine run 24 hours aday

Big Bertha Must Be Saved Five stories tall and the biggest drill of her kind, Bertha overheated in December 2013, only about a ninth of the way into the project to bore a tunnel under downtown ...

Seattle's Big Bertha Tunneling Machine Is Finally Back on ...

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big bertha tunnel boring machine run 24 hours aday

Deep beneath Seattle, something has brought the world's biggest tunnel boring machine to an abrupt halt. The tunnel is currently just 1,000 feet but planned to be almost 10,000 feet long.

Big Bertha: Mystery object blocks Seattle's tunnel drill ...

Dec 25, 2013 · Named after one of Seattle's early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700 tons, and does much more than drill.

Big Bertha -- world's largest tunnel boring machine ...

Bertha has made it to the finish line. The celebrity boring machine’s arrival near Seattle Center, some 29 months late, guarantees a Highway 99 tunnel bypassing downtown.

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