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