Alaskan Way Viaduct - Follow Bertha

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.

Alaskan Way Viaduct - Home

OLYMPIA — Tunnel-machine Bertha’s two-year breakdown will further delay the Highway 99 tunnel’s grand ... Seattle Tunnel Partners (STP ... project manager for ...

Bertha (tunnel boring machine) - Wikipedia

Seattle's big tunnel project ... A project to bore a tunnel under Seattle and ... the massive drill was also followed through the gloomy tunnel by a Bertha ...

Alaskan Way Viaduct replacement tunnel - Wikipedia

A worker is visible inside the SR 99 tunnel is this view looking south from the back end of the tunneling machine Bertha. (WSDOT via flickr) The slow crawl of Bertha, the tunneling machine making its way below Seattle’s Alaskan Way Viaduct, hasn’t been without its share of frustrating ...