Giant Tunneling Machines Finish Work in NYC » Boring Manhattan

In this March 18, 2011 file photo, one of two tunnel boring machines is shown while being assembled at the Sunnyside train yards in the Queens borough of New York. After 4 ½ years of work, the last machine went quiet on Monday, July 23, 2012. The seven machine fleet bored through bedrock and created 16 new transit tunnels under the city. (AP Photo)

In this March 18, 2011 file photo, one of two tunnel boring machines is shown while being assembled at the Sunnyside train yards in the Queens borough of New York. After 4 ½ years of work, the last machine went quiet on Monday, July 23, 2012. The seven machine fleet bored through bedrock and created 16 new transit tunnels under the city. (AP Photo)

FILE –

In this March 18, 2011 file photo, one of two tunnel boring machines is shown while being assembled at the Sunnyside train yards in the Queens borough of New York. After 4 ½ years of work, the last machine went quiet on Monday, July 23, 2012. The seven machine fleet bored through bedrock and created 16 new transit tunnels under the city. (AP Photo)

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