Poster for the film 'Dark Days', 2000.

'Dark Days' is a 2000 American documentary film directed, produced and photographed by Marc Singer. It follows a group of people living in an abandoned section of the New York City Subway system, more specifically the area of Freedom Tunnel.

When he relocated from London to Manhattan, Marc Singer was struck by the number of homeless people he had seen throughout the city. Singer had befriended many in New York's homeless community and later, after hearing of people living underground in abandoned tunnel systems, he met and became close to a group of people living in The Freedom Tunnel community stretching north from Penn Station past Harlem.

After living on and off with them for a number of months, he decided to create a documentary in order to help them financially, even though Singer had never been a filmmaker before. He saw the production of Dark Days as a means of gaining better accommodation for the residents of the tunnel. he film's crew consisted of the subjects themselves, who rigged up makeshift lighting and steadicam dollies, and learned to use a 16mm camera with black-and-white Kodak film. The post-production process took years, as financial difficulties created delays, as did Singer's insistence of creative control to protect the tunnel residents.