Given that he had just gotten out of a coffin, Jon assumed that this was some sort of crypt or mausoleum. But how did he get in here? And more importantly, how was he going to get out?
He slid his hands around the edges of the room, trying to find a door, but there wasn't one. The only light in the room came from a few cracks in the wall, but there didn't seem to be any way to make those cracks bigger, to get out. At least he knew that he was above ground, and as long as no one covered those cracks, he'd be able to breathe. But people couldn't live on oxygen alone. At some point, he'd have to have some water or food.
He sat down on the closed coffin, trying to think of what to do.