A 32nd-century Starfleet ship stationed at Starbase J-19 Alpha, which is sent to help the Academy's cadets against the Furies and is disabled in an ambush arranged by the pirate Nus Braka.
The USS Sargasso is a Starfleet ship in the first season of Star Trek: Starfleet Academy, seen in the episode Come, Let's Away. Its regular duty is to guard Starbase J-19 Alpha, where classified research is carried out.
When the Furies take a party of cadets hostage aboard the derelict USS Miyazaki, Nahla Ake learns that Nus Braka once drove the Furies off with a sonic weapon. With Admiral Vance's backing, the Sargasso is called away from the starbase and fitted to emit the same kind of pulse.
The plan is a trap. When the Sargasso arrives, the ship it finds belongs to Braka's Venari Ral, which disables it and escapes. With its guard ship gone, the starbase is raided, many of its people are killed and its experimental weapons are stolen. Braka had worked with the Furies to draw the Sargasso away.