Seattle’s famous tunnel boring machine emerged from the depths this week, marking the end of a nearly four-year journey burrowing 1.7 miles beneath downtown Seattle.
The project will replace the Alaskan Way Viaduct. The next steps involve cutting up Bertha for removal, finishing the double-decker underground highway, demolishing the viaduct, and clearing the way for Seattle’s new waterfront park.
The cost of the entire SR99 replacement project, expected to be completed in 2023, is estimated…