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  • Alaskan Way Viaduct - Tunneling

    The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: ... + Bertha's tunnel route

  • Bertha – The Tunnel is Finished, but Her Legacy Continues ...

    The Tunnel Boring Machine ("TBM") known as "Bertha," built by Hitachi Zosen Corp in Osaka, Japan, was the world's largest TBM at 57.5 ft. in diameter.

  • Bertha | The Seattle Times

    Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the successes and travails of Bertha, the biggest-ever boring machine.

  • 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.

  • Bertha, Seattle's SR 99 Tunneling Machine, Is Finally Done ...

    Apr 03, 2017 · Bertha has broken through. After nearly four years underground, Seattle's beleaguered boring behemoth clawed its way into daylight yesterday, leaving a 1.7-mile tunnel behind it. And now that its job is done, workers can at last move an aging, potentially dangerous stretch of elevated highway ...

  • World's biggest tunnel machine Bertha emerges from ... - Autoblog

    Bertha, the world's largest tunnel-boring machine, ends its journey today. It has spent four years traveling less than two miles to build a new car tunnel underneath Seattle.

  • Seattle's tunnel boring machine Bertha reaches end of long ...

    Apr 03, 2017 · Bertha, the machine digging a 1.75 mile tunnel under Seattle to replace a waterfront bridge with an underground roadway, had just 30 feet of mining left at the beginning of the day Tuesday.

  • Seattle's Big Bertha Tunneling Machine Is Finally Back on Track

    We've covered the saga of the SR99 tunneling machine, better known as Bertha, since it broke down after only drilling though just 52 feet in three days of operation. Now the Seattle tunnel boring machine is finally back on track. It just broken through an access repair tunnel and has since mined 73 ...

  • video bertha tunneling machine - kamanafoundation.com

    bertha world 039 s largest tunneling machine; bertha world 039 s largest tunnel-boring machine; seattle tunnel boring machine video; batter filling machine video

  • Tunnel boring machine - Wikipedia

    A tunnel boring machine ... but stalled in December 2013 and required substantial repairs that halted the machine until January 2016. Bertha completed boring the ...

  • Meet Crossrail's giant tunnelling machines - YouTube

    Dec 05, 2012 · Crossrail will use eight tunnel boring machines (TBMs) to construct the new tunnels under London. These huge machines will work 24 hours a day beneath the st...

  • Bertha Tunnel Machine - Image Results

  • bertha the tunneling machine - KAMY China - KAMY Company has ...

    bertha tunnel boring machine seattle; tunnel boring machine bertha; Grasping strong production capability, advanced research strength and excellent service, ...

  • Stuck In Seattle | Bloomberg Business - Business, Financial ...

    Stuck in Seattle The Aggravating ... We're here to see Bertha, ... a deep-bore tunnel, mined by a custom-built machine that digs without tearing up surface streets.

  • 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 Tunnel Machine - Video Results

  • #BerthaCam: Watch the giant boring machine at the end of ...

    Giant tunnel-drill machine Bertha broke into daylight shortly before 11:30 a.m. Tuesday after years of delays. We covered the scene live.

  • SR 99 (@BerthaDigsSR99) | Twitter

    @BerthaDigsSR99. Bertha completed her dig and now we're completing the work to replace ... It's been one year since Bertha broke through at the tunnel's north ...

  • Seattle viaduct demolition: When it will happen and what to ...

    With Bertha the tunnel-boring machine's job complete, the Alaskan Way Viaduct replacement tunnel's construction is well underway. This means that the viaduct's days are officially numbered. The Washington State Department of Transportation (WSDOT) is in the process of putting together the plan ...

  • The World's Largest Tunneling Machine Is (Finally) Getting ...

    Bertha, the world's largest tunneling machine, has been stuck under downtown Seattle since it broke in December 2013. Engineers have had to concoct a massive and expensive rescue plan—essentially a whole construction project in itself.

  • Alaskan Way Viaduct - Follow Bertha

    Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the latest tunnel progress, visit our new tracker page.

  • Under Seattle, a Big Object Blocks Bertha. What Is It? - The ...

    Dec 19, 2013 · In October, workers walked through the first rings of the highway tunnel being built under Seattle's waterfront toward the boring machine called Bertha.

  • 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.

  • Bertha - SR 99 Tunneling Machine | Flickr

    These photos highlight the journey of Bertha, the tunneling machine that dug the State Route 99 tunnel beneath downtown Seattle. Visit for more information.

  • Hard grind: The epic journey of the world's biggest tunnel ...

    On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant digger was tasked with the challenge of building a tunnel large enough to carry four lanes of motor traffic under the heart of Seattle. The story of how ...