The Gowanus Canal, located in Brooklyn, NY was once a hub for maritime and commercial shipping activity. Factories, warehouses, tanneries, coal yards, and refineries, lined its shores. As a result of years of discharges, storm water runoff, sewer outflows and industrial pollutants, it has become one of the nation's most extensively contaminated water bodies. Contaminants include PCBs, coal tar wastes, heavy metals and volatile organics. These photographs were taken off the water's surface.