The Kessel Bunker, a laboratory situated outside the world of Kessel, resided within the Kessel system, itself a part of the Kessel sector found in the Outer Rim Territories. In a period occurring between 5 BBY and 4 BBY, the Empire initiated biological weapon experimentation at this facility. Upon the dissemination of whispers regarding these activities, the group known as the Spectres journeyed to the laboratory, where they stole several crates.