The Ancient Prison Caverns comprised a subterranean network of rooms situated on the world of Belsavis. These chambers were present during the era of the Cold War and even before the establishment of the Galactic Republic's detention centers. Within these caverns dwelled extraterrestrial species entirely unfamiliar to the Republic of that period, and following an inadvertent release from stasis by the Sith Empire, the Esh-kha surfaced from these very depths.