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A worker finishes placing a banner while standing on a narrow ledge above a concrete wall where a massive tunnel machine is expected to break through the next day as it completes boring for the State Route 99 highway, Monday, April 3, 2017, under Seattle. Bertha, the machine digging a 1.75 mile tunnel under Seattle to replace a waterfront bridge with an underground roadway, is reaching the end of its journey. (AP Photo/Elaine Thompson)

A worker finishes placing a banner while standing on a narrow ledge above a concrete wall where a massive tunnel machine is expected to break through the next day as it completes boring for the State Route 99 highway, Monday, April 3, 2017, under Seattle. Bertha, the machine digging a 1.75 mile tunnel under Seattle to replace a waterfront bridge with an underground roadway, is reaching the end of its journey. (AP Photo/Elaine Thompson)

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