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Under Seattle, a Big Object Blocks Bertha. What Is It? - The ... Dec 19, 2013 · Something unknown, engineers say, has blocked the progress of the biggest-diameter tunnel-boring machine in use on the planet.

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Bertha The Largest Tunnel Boring Machine - YouTube. Jul 22, 2017 · On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground.

World 039 S Largest Tunnel Boring Machine - Image Results

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largest machine in the world. ... 2017 · SEATTLE — The world's largest tunnel-boring machine broke ... largest drilling machine in the world; world 039 s largest ...

The World's Largest Tunnel-Boring Machine | Popular Science

After a 2001 earthquake severely damaged the double-decker section of Seattle's Route 99 highway, state and city officials decided to move the main thoroughfare underground. In July, they unleashed Bertha, the world's largest-diameter tunnel-boring machine. Built in Japan and reassembled in the ...

bertha the world 039 s largest tunnel-boring machine

Reanimating Bertha, the world's biggest tunnel-boring machine. The world's biggest tunnel-boring machine, ... Seattle's tunnel even before Bertha ran into big trouble.

bertha world 039 s largest tunnel-boring machine

'Mystery object' that stopped $80m drilling machine for weeks ... An unknown object that stopped the world's most powerful tunnel boring machine digging underneath Seattle has finally been identified as a small steel pipe.

bertha the world 039 s largest tunnel-boring machine

Gizmag goes inside the world's largest tunnel boring machine. On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle.

The World's Largest Tunnel-Boring Machine Must Be Saved

The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, leaving the city's planned waterfront renaissance hanging in the balance.

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Gizmag goes inside the world's largest tunnel boring machine. On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle.

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Bertha (tunnel boring machine) - Wikipedia. Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a ...

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

The world's biggest tunnel boring machine, named after Seattle's first female mayor, has been brought to a halt

bertha world 039 s largest tunnel-boring machine

Some of the world's largest machines were ... An unknown object that stopped the world's most powerful tunnel boring machine digging underneath Seattle has ...

bertha world 039 s largest tunnel-boring machine

Under Seattle, a Big Object Blocks Bertha. What Is It? - The ... Dec 19, 2013 · Something unknown, engineers say, has blocked the progress of the biggest-diameter tunnel-boring machine in use on the planet.

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On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground. ... world 039 s largest tunnel boring machine;

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'The object': Something deep and mysterious has blocked the ... 'The object': Something deep and mysterious has blocked the world's biggest tunnel boring machine under Seattle The object's composition and provenance remain unknown almost two weeks after first contact becaus you can't exactly poke your head out the window and look

Gizmag goes inside the world's largest tunnel boring machine

On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. "Bertha," as it's known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake.