Deep Dig: Workers Build New York City's Second Avenue Subway

A worker walks south along the new tunnel between 72nd Street and 86th Street.  When the project is complete this tunnel is expected to carry 200,000 people daily.
A worker walks south along the new tunnel between 72nd Street and 86th Street. When the project is complete this tunnel is expected to carry 200,000 people daily. Jim Seida / NBC News

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