FILE PHOTO -- Workers make preparations to lift the cutting head from Bertha, the world's largest tunnel-boring machine, and lift it out for repairs in Seattle, Washington March 9, 2015. REUTERS/Jason Redmond/File Photo
SEATTLE (Reuters) - Bertha, one of the world’s largest boring machines, will cut through a thick concrete wall at midday on Tuesday if all goes according to plan, completing the most difficult phase of building a highway under the heart of downtown Seattle.
Reaching open air through 5 feet (1.5 m) of concrete is a major step in one of the most ambitious American municipal projects in recent years. Once complete, 2 miles (3 km) of Highway 99, an elevated roadway along a densely populated waterfront, will be rerouted to run beneath the city of 650,000 people.
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