http://www.nytimes.com/2011/07/25/nyregion/deep-below-park-avenue-a-200-ton-drill-at-rest.html A massive drill bit used to create NYC subway tunnels will be left underground and encased in concrete.
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http://www.nytimes.com/2011/07/25/nyregion/deep-below-park-avenue-a-200-ton-drill-at-rest.html A massive drill bit used to create NYC subway tunnels will be left underground and encased in concrete.