Alaskan Way Viaduct - Tunneling
The SR 99 Alaskan Way Viaduct, an elevated concrete structure built in the 1950s and vulnerable to earthquakes, is being replaced with a 1.7-mile tunnel running beneath downtown Seattle.Get Quote
World's biggest tunnel machine Bertha emerges from beneath ...
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.Get Quote
Seattle's Big Bertha Tunneling Machine Is Finally Back on Track
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.Get Quote
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.Get Quote
Alaskan Way Viaduct - Follow Bertha
The SR 99 tunneling machine, nicknamed Bertha, ... this page tracked her progress beneath Seattle. With the machine dismantled and ... Find the new tunnel progress ...Get Quote
Big Bertha's Two-Mile Subterranean Journey Is Almost Over
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 boring machine (TBM) in the world when it was built, Bertha weighs a gargantuan 6,700 tons and stretches 326 feet long.Get Quote
Bertha's big breakthrough is here: Seattle tunnel machine ...
After mining through more than 9,000 feet of Seattle underground, and rebounding from a lengthy breakdown and repair, Bertha the tunneling machine is poised to bust through its final obstacle on Tuesday.Get Quote
Alaskan Way Viaduct replacement tunnel - Wikipedia
The Alaskan Way Viaduct replacement tunnel is a ... Boring of the tunnel with the world's largest-diameter tunnel-boring machine (TBM) "Bertha ... Seattle Tunnel ...Get Quote
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.Get Quote
Bertha (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.Get Quote