Media members look on as dust fills a pit below while a massive tunneling machine nears breaking through a five-foot wide concrete wall into the disassembly area for the State Route 99 highway, Tuesday, April 4, 2017, under Seattle. After tunneling more than 9,000 feet and building an outer tunnel wall as it moved forward, the boring machine finished digging what will be a two-mile, double-decker traffic tunnel to replace the Alaskan Way viaduct, damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)
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