Compressed

Difficulty: Class 2
The Compressed Layer is the fourth level of the underground, and the last one before the Bedrock Plains, a layer that serves as a barrier between this first set of levels and the second.

The compressed layer is particularly interesting, because there are now compressed ores, which when mined will drop three of the ore's normal form. Very good for finding resources. However, normal ores will still spawn here.

This layer is fairly cavernous, but not exceptionally so. Still probably the best layer to go mining in if you're looking for resources.