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One of the oldest surviving homeless communities in New York City has been hidden from public view in an underground train tunnel since the 1970s. Residents dwell in continual darkness along the two-and-a-half mile stretch, which is penetrated only by shafts of light angling through air vents. The residents who have been there longest live alongside the tracks in cinder block bunkers originally used by railroad personnel. Other residents are hidden high above the tracks in recessed niches that are accessible only by climbing. More recent tunnel dwellers have built freestanding structures in the dark alcoves of the tunnel or perched themselves on concrete ledges.