The door at the back of the room had a sophisticated-looking maglock but was open a crack, due to the electrical cable that snaked through it and into the hallway beyond. There were doors on either side of the hallway, all but one of them held open by the electrical cable that had been run throughout the lab. All of these rooms were dark and silent. The one door that was closed bore a warning in both black letters and Japanese characters: EMERGENCY EXIT ONLY. WARNING. ALARM WILL SOUND . Carla wondered if the alarm was still working. If not—and if this door did lead up to the surface—this would make a good escape route if somebody surprised her in the lab.