Posted on May 18 2016 12:15 PM

Seattle Tunnel Partners resumed mining late Tuesday evening following a break for rest and routine maintenance.

Bertha has now installed 300 concrete tunnel rings and traveled more than 2,000 feet from the launch pit west of the stadiums. Her journey is more than 20 percent complete. She is approaching the start of Zone 3 , which will take her beneath the Columbia Street on-ramp to the viaduct and, later, beneath Western Avenue. Look for twice-weekly updates on the Follow Bertha page