chunk: The creatures are initially assumed to be transformed passengers, but Leland invites Bower's team to dinner and shows them mural drawings depicting their true origin. According to Leland, early in the mission Gallo developed Pandorum, as did the many passengers that he then brought out of hypersleep early. Taking advantage of their mental state, Gallo then convinced these insane passengers to exile themselves to the ship's enormous cargo hold to play a cruel cat-and-mouse game of survival which involved fighting, capturing, torturing, and eating each other. Eventually Gallo went back into hypersleep, leaving the descendants of the psychotics to evolve over the course of successive generations (accelerated by an enzyme produced in the hypersleep pod's feeding tubes), becoming a troglofauna species that now roams the ship, with Gallo's savage game becoming the centre of the mutated humans' culture.