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Bertha (tunnel boring machine) - Wikipedia

The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: the machine's cutterhead being lowered into the launch pit near Seattle's stadiums). The machine completed its tunneling on April 4, 2017 and was fully dismantled and removed from the tunnel on Aug. 23, 2017.

Alaskan Way Viaduct - Tunneling

Why 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.

Seattle Tunnel Boring Machine -- Bertha Rescue

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 schedule.

Tunnel boring machine - Wikipedia

August 2017: Final piece of dismantled machine removed While Bertha was underground, this page tracked her progress beneath Seattle. With the machine dismantled and removed, we are now tracking tunnel progress on a new page.

How did we get here? A look back on Seattle’s tunnel ...

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.

Alaskan Way Viaduct - Follow Bertha

12/20/2013 · In October, workers walked through the first rings of the highway tunnel being built under Seattle’s waterfront toward the boring machine called Bertha.

The World's Largest Tunnel-Boring Machine Must Be Saved

The world's largest tunnel-boring machine which is building a multi-billion dollar underground highway beneath Seattle has finally completed its missions - three years later than planned.