Here's the latest article I could find about it:
Seattle tunnel machine still stalled by mystery blockage
Published: Dec 26, 2013 at 1:18 PM PST Last Updated: Dec 26, 2013 at 1:35 PM PST
SEATTLE (AP) - The huge machine drilling a highway tunnel under downtown Seattle remains stalled by a mysterious blockage.
A spokeswoman for the state Transportation Department, KaDeena Yerkan, says Thursday we probably won't know anything new until after the first of the year.
Wells have been pumping out water so that workers might be able to identify the obstruction that halted progress on Dec. 7.
The machine called Bertha is about 60 feet under Seattle streets and about one-tenth of the way toward completing a 1.7-mile tunnel. It will carry Highway 99 traffic and allow the demolition of the Alaskan Way Viaduct on the waterfront.
This just smells like the government and a bureaucracy is involved in not knowing what the hell is going on, LOL.
I could just picture an old iron-ass company man or tool pusher being told,"We've been here a week on your well and have no idea what the problem is", it wouldn't be pretty :)