Wait -- if there was a smelter and a forge down here, not to mention fires for cooking or other uses, how did they avoid the cavern filling with smoke? Honour glanced up, but even with the reasonable amount of lighting illuminating the marketplace, she couldn’t make out any details in the cavern ceiling. Except maybe the ventilation wasn’t in the ceiling at all; as she passed by the shop and entered an open square, she felt a steady, soft breeze coming from her left. Some kind of forced ventilation, maybe like the gadget powering the pools and hot tubs in the Spa Dalecarlia? She supposed it doesn't really matter -- the batponies had been living under here for almost two years; If they were going to choke on their own smoke, they'd have done so already.