Joker Describes ‘The Cooler’

Joker: The door to the cooler is weathered wood with an ironwork across the middle. While there is no door handle, there are claw marks on bottom of the door, as if something or someone couldn’t get out. The sounds of dripping water echo through the cooler. I don’t know how big the cooler is, but I tried to explore a little after I heard voices coming from the darkness. The further I went, the fainter the light blub got. As I was walking, I tripped on a what appeared to be a human tibia bone, but I am not sure. Then I heard a deep growling sound from the darkness, so I ran back toward the light.

Question: Anyone discover anything else in there?