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Nine thousand two hundred wreaths lay on the graves of servicemen and women at the Florida National Cemetery in Bushnell, Fla., Dec. 14, 2013. The Wreaths Across America campaign reached over 500 different cemeteries worldwide this year. (U.S. Air Force photo by Airman 1st Class Ned T. Johnston/Released)

Tunel Boring Machine (TBM)

Mission to repair Bertha tunneler hits another delay

What's Blocking Bertha, Seattle's 5-Story Tunneling Machine? : The Two-Way : NPR

Subway tunnel construction at Lexington Avenue and 97th Street.