Kells, the mobile capital city situated on the planet Serob 6, had a unique demographic makeup. The native Sorkis, who favored an aquatic existence, constituted a mere 1% of the populace. The remaining 99% was largely comprised of Humans and various alien species from across the galaxy. This diverse group included a large influx of sightseers, the Imperial governor and his administrative team, along with an Imperial military presence.
As the Galactic Civil War raged, Kells suffered an aerial assault from a fleet of autonomous droid ships operated by the AI. In response, the Imperial Governor commanded the city's inhabitants to leave Kells and find safety in the planet's deep underwater trenches.