Updated

Bertha gains speed under viaduct

A recent look inside Highway 99 tunnel-boring machine Bertha, with the cutter head at the far end. (Steve Ringman/The Seattle Times)
A view inside the Highway 99 tunnel-boring machine Bertha, with the cutter head at the far end. (Steve Ringman / The Seattle Times)

Bertha has advanced more than 100 feet since the morning of April 29, when the viaduct was closed to traffic as a safety precaution. The shutdown is estimated to last two weeks.

Seattle Times Marketplace

Jobs

NWhomes

Autos