David, the Developer, is a mean old-school dungeon master that likes to toss your character into unknown places with no equipment. But, he is kind enough to leave a way for you to escape.
After waking up in the Unknown Dungeon, there's a way to get the attention of the prisoner in the next cell who will help you escape. It's a short dungeon but can be challenging as you won't have your equipment.
You can load a previous save state (yellow folder icon on load menu) if you want to just say heck with the dungeon for now.