Bay Door Control (BDC) held the duty of operating the bay doors located on the first Death Star, opening and closing them as needed. BDC would verify each order given by outgoing crew members, cross-referencing their flight plan with Flight Control. The officer overseeing the operation would only authorize the creation of a force field within the bay, an energy barrier potent enough to contain the internal atmosphere while still allowing starships to pass through, if everything checked out. Following the ship's departure, the bay doors would be sealed and the force field deactivated.