Undercity

Urban historian and explorer Steve Duncan, takes us through abandonded Subway stations, New York's earliest sewers, and to the top of Williamsburg Bridge. 

UNDERCITY from Andrew Wonder on Vimeo.

Also if you were wanting more info here is his website: http://www.undercity.org/

and here is an NPR story: http://www.npr.org/2011/01/02/132482428/into-the-tunnels-exploring-the-underside-of-nyc