Erling Kagge experiences New York like never before - underground. Along with Steve Duncan, an urban historian and photographer, he descends into the network of sewers, subways and water tunnels. They traverse the length of New York, from the Bronx to Manhattan. Their final stop: the Atlantic Ocean. Through photos, philosophical reflections and accounts of their journey a world opens up that has never been explored before. Erling describes what he sees en route, a 'negative beauty' formed by the absence of colour, light and a natural order.