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http://www.seattletimes.com/seattle-news/transportation/berthacam-watch-the-giant-boring-machine-emerge-at-end-of-highway-99-tunnel/
Bertha the tunnel-boring machine has just broken through the concrete barrier at the northern terminus of the Hwy 99 tunnel in downtown Seattle.
Bertha the tunnel-boring machine has just broken through the concrete barrier at the northern terminus of the Hwy 99 tunnel in downtown Seattle.