The Transportation Department's cultural resources manager, Steve Archer, says workers started boring probes Thursday to determine if archaeological work is needed. The shaft will be dug through an area filled-in years ago along the Seattle waterfront.
The department's deputy administrator on the tunnel project, Matt Preedy, says contractors hope to have a plan next week for the 120-foot shaft. They plan to drive the machine called Bertha into the shaft so the cutting head's bearings and seals can be repaired.
The machine ground to a halt in early December 1,000 feet into the 1.7-mile Highway 99 tunnel that will replace the Alaskan Way Viaduct.