Bertha

Seattle’s massive highway tunneling project delays while solutions are sought for the mechanical error that brought the project’s massive drilling machine, Bertha, to a halt. Some are starting to examine life after Bertha.
Feb 14, 2014   Seattle Transit Blog
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.
Jan 21, 2014   The Seattle Times
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.
Dec 20, 2013   The New York Times