What happens if a sinkhole opens up while Bertha is drilling underneath the viaduct? Short version: "We don't know," according to the state. "There are many measures STP can take if they see a ...

Bertha is still stuck, and now crews are bringing in a crane and big drills in hopes of determining what’s stopping the deep-bore tunnel machine and removing the mystery object. The massive ...

Bertha, the world’s largest boring machine, is scheduled to begin drilling again in November, after sitting idle for repairs. But some worry the tunnel project will eventually lead to the court ...

Tunnel-boring machine Bertha is taking on a new nickname this week: Sandy. Seattle Tunnel Partners (STP) began pouring sand into the stopped Highway 99 tunnel drill’s 120-foot-deep repair vault ...

About 750 days after she first broke down, Bertha, the massive drill long stuck under Seattle’s waterfront, is back to work. Five stories tall and the biggest of her kind, Bertha overheated in ...