At the bottom the tunnel went flat, and they caught sight of the cave going left in an impossibly tight turn, but they went past it into a dead end with a flat surface at the end that had a U-turn arrow painted on it. All of them shifted in the air so their rear legs hit the giant sign, and they used it to launch themselves in the opposite direction, and followed the signs that pointed up the tunnel they missed. A tunnel the other group was coming down.