The USS Thantasaras was a starship in service to Starfleet in the late 24th century. The Thantasaras was on of the vessels to survive the Borg Invasion of 2381. Following the invasion, the Thantasaras reported to Starbase 22, where station's counselor, Brian Ellis, counselled the Thantasaras medical staff. (ST novel: A Singular Destiny)