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 cutterhead diameter of 57.5 feet (17.5 m) across.
Learn MoreWhy Seattle's Huge Tunnel-Boring Machine Is Still Stuck A year after Bertha got stuck, plans to free the big machine have stalled. And there's another problem.
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Learn MoreWatch Bertha, the world's largest tunnel boring machine, emerge from beneath Seattle by Kurt Schlosser on April 4, 2017 at 10:01 am April 4, 2017 at 4:42 pm Comments 15 Share 20 Tweet Share ...
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Learn MoreBertha 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.
Learn MoreA giant drill boring beneath a section of Washington's State Route 99 has ground to a halt after hitting a mysterious clog some 60 feet underground. ... "Bertha," the massive tunnel boring machine ...
Learn MoreBertha (tunnel boring machine) - Wikipedia. Bertha was a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.
Learn MoreThe normally sedate city of Seattle sounded more like the set of a science fiction epic today as the world's largest boring machine roared and screeched its way into the open air. The tunnel boring machine, better known as "Bertha" cut through a wall of r
Learn MoreBertha’s end could be near. The world’s largest tunnel-boring machine is on schedule to break into daylight this spring after a tumultuous dig under downtown Seattle that’s years behind ...
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