Cave 158

It seems that this cave may be exclusive to the Caveland Pro edition.

Resources:

 * 1x Crystal
 * 1x Blueprint
 * 1x Monument Piece

Walkthrough:
This cave is straightforward and requires 1 Dwarf to beat. Simply guide your dwarf through the cave. After dropping down a ledge, there is a hidden button on the right that teleports you to a room where you can collect a crystal and blueprint. Flipping the lever will bring you back out, so do this last. The hole is now closed, so you can safely walk across and pull the lever on the other side to allow access to the monument piece.