The cutterhead on Seattle's troubled tunnel boring machine broke through the wall of a rescue pit at midday Thursday.
This is just the beginning of a complicated repair plan. Next, crews plan to remove the front of the balky machine and pull it out of the pit.
Governor Jay Inslee tempered his pleasure at getting good news on the contentious highway tunneling project.
"People have to understand there is going to have to be a lot of work on this machine to get it operable,” he said. “It is great to see movement, but there's a long ways to go."