Deep Space Delta Zero-One, or DSD01, is a Nor-class Cardassian space station that had been turned over to Starfleet and the Federation by the Cardassian Union in the late 24th century. As of 2385, it is stationed in the Delta Quadrant, around the orbit of an M-class planet colonized by the Federation that is located 20 light years inside the quadrant's terminus facing the Beta Quadrant.