; A felled tree on the surface disturbs your operation. : A felled tree is laying over the surface of the tile where the tunnel will be created. Occurs when mining from the inside out.
; Current tile needs a flat border to correspond to lower part of adjacent cave entrance. : Need to surface mine the bottom slope of the adjacent tile to match the slope of the mine entrance. Only when creating a multi-tile entrance.
; Lowering the floor further would make the cavern unstable. :Occurs when ceiling is too high above the floor.
[[Category:Babel/M]]