Something Called 'The Object' Stops World's Largest Tunnelling Machine

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.

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It's one of Paul Bunyan's turds.