Seattle crews have dug 90 feet of the 120-foot access pit to retrieve Bertha, the tunneling machine stalled beneath the Alaskan Way Viaduct, according to the Puget Sound Business Journal. Digging paused for two weeks while the crew sealed the pit's walls for watertightness, but resumed on Jan. 8.
When the pit is complete, a crane will lift Bertha’s 57-foot-diameter cutting head from the pit and crews will complete repairs on the machine’s bearing and seals.
Bertha has been stalled for more than a year. Projections estimate the Alaskan Way Viaduct project will be complete in 2017.
Source: Puget Sound Business Journal