Bertha, the world’s largest tunnelling machine, churning through the
rock and mud beneath Seattle, has hit a mysterious roadblock — so
mysterious, it is only known for now as “the object”.
Whether it’s ice age super-rocks, buried trains, a lost city — or
even a UFO — engineers might have to work “at atmospheric pressures
similar to what a diver would experience,” the
New York Times adds, and even spend “time in a decompression chamber” on their way back up to the surface, to find out.
So what is it? What is “the object” blocking Bertha’s path? Just look
at the size of the tunnels it’s been digging; what ever’s in the way has
got to be one tough mother.
Read more here
It's one of Paul Bunyan's turds.