There are not many places of interest down here. The Evil Castle might be of interest, though. It is located at X: 32 Y: 83.
Depending on which way you took to get down here, you'll either start at X: 89 Y: 34 (that's the cave entrance) or X: 49 Y: 9 (that's the crack in the ceiling).
Before you go to the castle you can always head for X: 4 Y: 53. That's entrance to a tunnel leading to a cave in the cave, where some gazers and some ropers are living. After the monsters are dead, a chest will appear at the eastern end of the cave. It will be magicalllly protected for a while, so hang around until it turns up.
