Nobody leaves without our consent. Also, upon arrival we give them a medical injection to help their bodies cope with the terrible pressures down here. Actually, it’s a powerful narcotic extracted from deepweed and genetically altered. Once administered, the worker must continue to take more of the substance daily for life. If an unauthorized person escaped to the surface, he’d be unconscious within hours, dead in a day without the antidote." She smiled. "Because, you see, they don’t even know about the drug. We place it secretly in their food, beer, soymilk, candy, even the free cigars and cigarettes we regularly distribute from quote—manufacturing excess—end quote."