Dark Days is a documentary made by Marc Singer, a British filmmaker. The film follows a group of people living in an abandoned section of the New York City underground railway system, more precisely the area of the socalled Freedom Tunnel.
After living with them for a number of months, he decided to create a documentary in order to help them financially. Singer had never been a filmmaker before, and saw the production of Dark Days as a means of gaining better accommodation for the residents of the tunnel.The films crew consisted of the subjects themselves, who rigged up makeshift lighting and steadicam dollies, and learned to use a 16mm camera with blackandwhite Kodak film. The postproduction process took years, as financial difficulties created delays, as did Singers insistence of creative control to protect the tunnel residents. ........
Source: Wikipedia