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.

The final piece of Bertha being lifted from the disassembly pit

An abbreviated history of Bertha:

July 2013: Began tunneling
April 2017: Tunneling breakthrough
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.

Find the new tunnel progress tracker here