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‘The object’ stops world’s largest tunneling machine

Bertha, the world's largest tunneling 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.": http://gizmodo.com/something-called-the-object-has-stopped-worlds-large-1487090414?utm_campaign=socialflow_gizmodo_facebook&utm_source=gizmodo_facebook&utm_medium=socialflow

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