From early 2009 to mid-2010, the Underbelly Project was the world’s best-kept urban art secret. This is the only book documenting the project, during which the world’s leading urban artists, such as Swoon, Faile, Revok, and Lister, made late-night trips to an abandoned New York City subway station, painting night after night to transform the space into the largest underground art gallery in the world.