The Federation space station Deep Space 3 was commanded by Admiral Marcus Holt in the late 24th century and is located near the Black Cluster. Deep Space 3 hosted the palio of 2370, where the Ferengi had already been accused of trying to bribe the Breen pilot into throwing the race.
In 2370, the USS Hera left Deep Space 3 on a courier mission and disappeared shortly after. (TNG: "Interface")
- Deep Space 3 is mentioned in Max Grodénchik's "Rom's Song", as the station where Odo moves to.