Deep Space Station B-5 was B-type Federation starbase in service during the mid-23rd century. It was a diplomatic and trading outpost located in the Euphrates sector. (Star Trek: Pendragon) Space Station B-5 was constructed during the 2250s. It became operational in 2257, under the command of Commodore Jeffrey David Sinclair. During the 2260s and 70s, the station was a port of call for the starships Agamemnon, Alexander, Churchill, Excalibur, Hyperion and Victory.