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The viaduct will be torn down section by section.
A man working inside the Highway 99 tunnel fell 15 feet.
Seattle Mayor Ed Murray called Bertha's breakthrough a "major construction milestone" in the plan to reclaim the city's waterfront.
As Seattle's tunnel boring machine nears the end of its journey beneath downtown Seattle, we're hearing from one of the project's longtime supporters: former governor Chris Gregoire.
The new administrator for the Alaskan Way tunnel project has a big task ahead of him.
The contractors who built Bertha the tunnel machine two years ago have filed a lawsuit seeking $11 million in extra pay.
The troubled project to replace Seattle's Alaskan Way Viaduct with a tunnel is $223 million over budget.
The new State Route 99 will be a double-decker roadway, similar to the viaduct, but the building process is a little different when the working environment isn’t a flat surface.
5-person crews will have to go through a hyperbaric chamber and a series of man locks, which will prepare them to enter a pressurized excavation chamber behind the tunnel boring machine's cutter head.
Seattle real estate developer Martin Selig, a key financial backer of I-123, is now putting his money behind the measure's opposition.