This collection of photographs centres on one specific network of hidden New York - its water delivery system. Stanley Greenberg began photographing these sites in 1992 after years of petitioning New York authorities to give him access. Since then he has travelled to places as varied as dams in remote regions of upstate New York and tunnels 800 feet below the streets of Brooklyn. He finished his shooting in the spring of 2001, just before the events of 9/11 closed most of these sites to all access.