They usually go both ways, though, don't they? Entrances and exits, I mean?

[ As soon as he's back on his feet, Jamie grabs Leon's arm again. (After all, who knows what could happen if they lose track of each other in the darkness?!) Then he pulls out his phone (thank god it survived the fall) and turns on the flashlight app. ]

There has to be some way out other than where we fell through... probably...