; ? The cave wall sounds hollow. : Appears when you are mining into another mine shaft and the height difference is not dangerous.
; ? A dangerous side shaft will appear. : Occurs inside a mine. This message appears when the tile you are excavating shares a single corner with an existing tunnel. To excavate it you must first excavate so the target tile shares an entire wall with the other tunnel. See example on the right.
; The cave walls look very unstable. You cannot keep mining here. : Occurs inside a mine. Exact cause unknown but it happens Happens when mining close to the top of the rock layer, and can . The ceiling of the newly mined tile would break the rock layer. Can sometimes be avoided by mining downwardsor by lowering the mine floor and thereby opening the new tile a bit lower.
; You hear falling rocks on the other side of the wall. A deep shaft will probably emerge. : Occurs inside a mine. Caused when there is already another mine nearby, but there is too much of a height difference to connect the two mines.
; The cave walls look very unstable and dirt flows in. You would be buried alive. : Occurs inside a mine. Happens when the tile you are mining on will break out to the surface, but the surface is not exposed rock. To excavate it, you must first expose the rock on the surface.