Seattle tunnel machine finishing troubled journey

Seattle • The world’s largest tunnel-boring machine broke through a concrete wall beneath Seattle on Tuesday to reach the end of its long, troubled journey, a milestone in a multibillion-dollar project to replace an aging highway hugging the city’s waterfront. Critics of the effort to build an underground roadway called it an overpriced endeavor that would collapse under the weight of its ambition and mounting costs. For a while, they looked to be right as the machine, known as Bertha, broke do...

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