Underground cavern

You awaken slowly as your mind slowly pieces together what happened. All at once you remebered. Walking across the street without looking, the open manhole you didnt bother noticing, the long fall, the sickening darkness...

Your eyes snap open, sitting up quickly to look around. You find yourself upon a large flat rock, smooth as glass. You seem to be in some cavern, but where it should have been pitch black it instead has a soft, well lit glow from what seems to be moss growing in large patches on the floor and cieling.

Your eyes are drawn to what look like ruins on the far side, ancient and crumbling, resembling a crypt.

You look up, seeing no hole from which you fell from, and looking along the walls reveals no exits.