find it by probing, after all. He could see the side duct, because there was light in both directions. The teachers didn't have the same lights-out rules as the students, and their quarters were smaller, so that vents came more frequently, spilling more light into the duct.
In the first room, a teacher was awake and working at his desk. The trouble was that Bean, peering out of a vent screen near the floor, could not see a thing he was typing.
It would be that way in all the rooms. The floor vents would not work for him. He had to get into the air-intake system.
Back to the vertical duct. The wind was coming from above, and so that was where he had to go if he was to cross over from one system to another. His only hope was that the duct system would have an access door before he reached the fans, and that he would be able to find it in the dark.
Heading always into the wind, and finding himself noticeably lighter after climbing past seven decks, he finally reached a wider area with a small light strip. The fans were much louder, but he still wasn't near enough to see them. It didn't matter. He would be out of this wind.
The access door was clearly marked. It also might be wired to sound an alarm if it was opened. But he doubted it. That was the kind of thing that was done in Rotterdam to guard against burglars. Burglary wasn't a serious problem on space stations. This door would only have been alarmed if all doors in the station were fitted with alarms. He'd find out soon enough.
He opened the door, slipped out into a faintly lighted space, closed the door behind him.
The structure of the station was visible here, the beams, the sections of metal plating. There were no solid surfaces. The room was also noticeably colder, and not just because he was out of the hot wind. Cold hard space was on the other side of those curved plates. The furnaces might be located here, but the insulation was very good, and they had not bothered to pump much of that hot air into this space, relying instead on seepage to heat it. Bean hadn't been this cold since Rotterdam ... but compared to wearing thin clothing in the winter streets with the wind off the North Sea, this was still almost balmy. It annoyed Bean that he had become so pampered here that he even cared about such a slight chill. And yet he couldn't keep himself from shivering a couple of times. Even in Rotterdam, he hadn't been naked.
Following the ductwork, he climbed up the workmen's ladderways to the furnaces and then found the air-intake ducts and followed them back down. It was easy to find an access door and enter the main vertical duct.
Because the air in the intake system did not have to be under positive pressure, the ducts did not have to be so narrow. Also, this was the part of the system where dirt had to be caught and removed, so it was more important to maintain access; by the time air got past the furnaces, it was already as clean as it was ever going to get. So instead of shinnying up and down narrow shafts, Bean scrambled easily down a ladder, and in the low light still had no trouble reading the signs telling which deck each side opening led to.
The side passages weren't really ducts at all. Instead, they consisted of the entire space between the ceiling of one corridor and the floor of the one above. All the wiring was here, and the water pipes - hot, cold, sewer. And besides the strips of dim worklights, the space was frequently lighted by the vents on both sides of the space - those same narrow strips of vent openings that Bean had seen from the floor below on his first excursion.
Now he could see easily down into each teacher's quarters. He crept along, making as little noise as possible - a skill he had perfected prowling through Rotterdam. He quickly found what he was looking for - a teacher who was awake, but not working at his desk. The man was not well known to Bean, because he supervised an older group of launchies and did not teach any of the classes Bean was taking. He was heading