January 16, 2016, 11am PST
The adventure of Bertha the tunnel-boring machine, already two years behind schedule, has a new twist.
December 27, 2015, 11am PST
Baby steps are an improvement for the tunnel-boring machine known as Bertha. The drill moved a total of 1.5 feet this week, but the symbolic distance probably felt like a mile.
June 16, 2014, 1pm PDT
Big Alma is one of two boring machines used to tunnel under the streets of San Francisco to construct the new Central Subway to Chinatown. Big Bertha, Seattle's infamous tunnel borer, has been stalled since December. Big Alma emerged on June 11.
The San Francisco Examiner
January 21, 2014, 8am PST
Though Seattle's giant tunneling machine remains stuck 60 feet under South Main Street, muck is starting to be flung above the surface. An email from Washington's Transportation Secretary reveals concerns over the conduct of the machine's operators.
December 20, 2013, 10am PST
Is it a giant rock? What about a sunken ship? Beneath Seattle's waterfront, a mysterious object has halted Bertha, the world's largest tunnel-boring machine. Stumped engineers are unclear on how long a highway tunneling project will be suspended.
December 18, 2012, 11am PST
Fearing years of costly disruption from the construction of a key link connecting the region's rail systems, some of downtown L.A.'s largest property owners are suing the Metropolitan Transportation Authority.