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Big Bertha's Two-Mile Subterranean Journey Is Almost Over

2017-1-25  Washington State Department of Transportation More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel

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

2017-4-5  The tunneling machine, named for former Seattle mayor Bertha Knight Landes, boasts a 57-foot diameter and measures 325 feet long. After dropping into a pit in July 2013, it started digging the...

Seattle's Big Bertha Tunneling Machine Is Finally Back on

2016-1-8  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

Big Bertha: Mystery object blocks Seattle's tunnel drill

2013-12-17  Big Bertha: Mystery object blocks Seattle's tunnel drill Deep beneath Seattle, something has brought the world's biggest tunnel boring machine to an abrupt halt. The tunnel

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

2017-5-1  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 it

Mystery of Seattle's Tunnel Borer Blockage Solved

2014-1-5  When it got stuck, big Bertha was only about 1,000 feet into a two-mile-long boring journey under Seattle for the tunnel that will replace the city's waterfront viaduct

Who Killed Bertha? Why the Seattle Tunnel Disaster Isn't

2021-5-21  “Bertha, the largest TBM ever built, ‘raising the bar,’” wrote Juan Louis Magro, a construction manager for Seattle Tunnel Partners (STP), the joint venture of

Anything but boring: World's largest tunnelling machine

2016-2-2  Big Bertha, Seattle’s famous tunnel boring machine, is stuck underground again. Bertha was running for just under a month following a two year delay to fix a broken cutter head. And the machine

Seattle tunnel construction avoided costly mistakes of

2019-1-18  Seattle used Bertha, the tunnel boring machine, to create the Highway 99 tunnel. Both tunnels were delayed and over-budget, but the numbers are significantly different. The Big Dig was projected

Seattle's Big Bertha Tunneling Machine Is Finally Back on

2016-1-8  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

Big Bertha: Mystery object blocks Seattle's tunnel drill

2013-12-17  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 world’s largest tunnel boring machine

2021-5-20  Big Bertha world’s largest tunnel boring machine facing big Seattle challenge Named after one of Seattle’s early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700

Who Killed Bertha? Why the Seattle Tunnel Disaster Isn't

2021-5-21  Bertha’s in heavy rotation (above): A giant red crane slowly rotates the SR 99 tunneling machine’s front end from a horizontal to a vertical position as it is lowered into the access pit on Aug. 24, 2015, two years after the incident occurred. This story follows our feature story, "Spin Zone," which appeared in the October 2017 issue of Seattle Business magazine.

World's biggest tunnel machine Bertha emerges from

2017-4-4  Bertha, which at 57.5 feet in diameter was the world's largest tunnel-boring machine when it entered the ground, ends its four-year, 1.7-mile odyssey beneath Seattle today, its job to dig a new

Anything but boring: World's largest tunnelling machine

2016-2-2  Big Bertha, Seattle’s famous tunnel boring machine, is stuck underground again. Bertha was running for just under a month following a two year delay to fix a broken cutter head. And the machine

Bertha breaks through: World's largest boring machine

2017-4-5  According to the WSDOT, Bertha's breakthrough is a good news/bad news event. On the one hand, a tunnel unique in the world has been dug, but it has a dirty big digging machine blocking it.

Seattle tunnel construction avoided costly mistakes of

2019-1-18  Seattle used Bertha, the tunnel boring machine, to create the Highway 99 tunnel. Both tunnels were delayed and over-budget, but the numbers are significantly different. The Big

Tunnel timeline: From conception to tunnel completion to

2019-12-13  Seattle tunnel critic files lawsuit to stop repairs on Bertha. WSDOT, STP announce tunneling will not resume until March 2015. Related: With Bertha at

Contractor ordered to pay Washington The Seattle Times

2019-12-13  The tunneling machine Bertha breaks into daylight in 2017. A jury has awarded Washington state $57.2 million in damages over delays in the downtown Seattle Highway 99 tunnel project.

Meet Big Bertha, The World’s Largest Tunnel Boring Machine

2019-5-24  Big Bertha was manufactured and supplied by the Hitachi Zosen Corporation to Seattle Tunnel partners for the SR 99 tunneling project. It measures 57.2 feet (17.5 m) in diameter, which makes it the largest tunnel boring machine in history.

Big Bertha world’s largest tunnel boring machine

2021-5-20  Big Bertha world’s largest tunnel boring machine facing big Seattle challenge Named after one of Seattle’s early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700

World's biggest tunnel machine Bertha emerges from

2017-4-4  Bertha, which at 57.5 feet in diameter was the world's largest tunnel-boring machine when it entered the ground, ends its four-year, 1.7-mile odyssey beneath Seattle today, its job to dig a new

Seattle's big tunnel project reaches a milestone, but it's

2017-5-1  It helps that divided Seattleites found something to like in the $80-million, 326-feet-long tunnel boring machine, known as Bertha. The nickname honors Bertha Landes, Seattle’s first and only

Anything but boring: World's largest tunnelling machine

2016-2-2  Big Bertha, Seattle’s famous tunnel boring machine, is stuck underground again. Bertha was running for just under a month following a two year delay to fix a broken cutter head. And the machine

Bertha breaks through: World's largest boring machine

2017-4-5  According to the WSDOT, Bertha's breakthrough is a good news/bad news event. On the one hand, a tunnel unique in the world has been dug, but it has a dirty big digging machine blocking it.

What Blocked Seattle Tunnel: A Lowly Pipe Newser

2014-1-6  The mystery underground object that had been blocking the giant Big Bertha tunnel boring machine under Seattle turns out to have been something pretty boring: An 8-inch diameter...

Tunnel timeline: From conception to tunnel completion to

2019-12-13  Seattle tunnel critic files lawsuit to stop repairs on Bertha. WSDOT, STP announce tunneling will not resume until March 2015. Related: With Bertha at

Bon Voyage, Big Bertha! Seattle Digs a Cave For the Future

2013-7-31  Big Bertha Is Digging Seattle's Massive Underground Freeway. The 2001 earthquake that brought down a length of State Route 99 running through downtown Seattle

Bertha reaches finish line of Seattle tunnel KIRO 7 News

2021-5-19  Bertha reaches finish line of Seattle tunnel April 05, 2017 at 11:47 am PDT By KIRO 7 News Staff and Graham Johnson, KIRO 7 News SEATTLE — On Tuesday morning, the moment finally came.