Demora Sulu's mother, Susan Ling died in Starbase 189's sickbay in the 2270s decade. (ST - The Lost Era novels: Serpents Among the Ruins, One Constant Star) Jefferson Blackmer was assigned to Starbase 189 for around five years. The starbase was his first posting after graduating from Starfleet Academy. (ST - Typhon Pact novel: Plagues of Night, DS9 novel: Sacraments of Fire) During Blackmer's posting to Starbase 189, a Quist boarded the starbase and entered a reception for a visiting admiral. (ST - The Fall novel: Revelation and Dust)