(covers information from several alternate timelines)
In an alternate quantum reality visited by Worf in 2370, Deep Space 5 was responsible for new starship developments and the object of covert surveillance by the Cardassians, along with Starbase 47, the Iadara colony, and the Utopia Planitia Fleet Yards. (TNG: "Parallels")
In 2373, Deep Space 5 reported the complete destruction of the colony on Ivor Prime. It was subsequently determined that the Borg were responsible, and were mounting a new attempt at an invasion of the Federation. (Star Trek: First Contact)
|Deep Space stations|
|Deep Space Station K-7 • Tau Ceti Deep Space Station • Deep Space 3 • Deep Space 4 • Deep Space 5 • Deep Space 7 • Deep Space 9 • Deep Space 12 • Hubble Deep Space Station|
According to Star Trek: Star Charts (p. 66) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Deep Space 5 was located in the Beta Quadrant.
Deep Space 5 was also mentioned in the Star Trek: Deep Space Nine - Core Game Book as well as in the New Frontier novel House of Cards. In the latter, the station was located near Sector 221-G, a region of space that included the planets Danter and Xenex and the former Thallonian Empire. The station was under the command of Admiral Edward Jellico. The refitted USS Excalibur launched from Deep Space 5 on its mission to render humanitarian aid to Sector 221-G.