Tunnel in the cliffs is a minor location in Kingdom Come: Deliverance II.
It's located in the southern part of the Apollonia region near an enemy camp. The tunnel has a few useful early start items, notably a kettle hat and dagger. A short distance away is also a Billhook and Bearded axe.
Hidden treasure[]
A skeleton with two crossbow bolts in its torso can also be found sitting beneath a map carved in the tunnel wall. The map reveals the location of a hidden treasure chest, which can be found north of Trosky castle.