Skip to content
Advertisement

A concrete-walled pit surrounds a circular, five-foot deep 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 concrete-walled pit surrounds a circular, five-foot deep 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)

Featured Photo Galleries