Days (2000) about the tunnel, using footage shot in the mid-1990s. Singer's later visit to the tunnel in 2011 is included in the film's 10th anniversary DVD release. Anthropologist and journalist Teun Voeten wrote the very detailed Tunnel People (2010). Explorer and writer Moses Gates describes his multiple encounters with other urban explorers and homeless people including one who resided in the tunnel for over thirty years in his book Hidden Cities (2013). See also Graffiti in the United States Urban exploration References External links Amtrak tunnels Culture of New York City Former squats Graffiti in the United States Homelessness in the United States Railroad tunnels in New York City Riverside Park (Manhattan) Shanty towns in the United States Squatting in the United States Subterranea of the United States Tunnels in Manhattan Upper West Side Urban exploration West Side Line Housing in New York City