: This message appears when the tile being mined shares a single corner with an existing tunnel. To continue, adjacent tiles must be mined out before mining can continue on this tile. See example on the right.
; The cave walls look very unstable. You cannot keep Mining here would open a cave exit, but there aren't enough solid walls to support it, so you stop mining here. : This message appears when mining close to the top of the rock layer. The ceiling of the newly mined tile would break the rock layerin a way that would try to form an impossible entrance. Can This can sometimes be avoided by mining downwards or by lowering the mine floor and opening the new tile a bit lower.
; The cave walls look very unstable and dirt flows in. Mining here would open a cave exit, but the dirt above would bury you alive, so you stop mining.
: This message appears when the tile being mined will break out to the surface, but the surface is not exposed rock. To open the entrance, the rock on the surface must be fully exposed. To continue mining forward this can sometimes be avoided by mining downwards or by lowering the mine floor and opening the new tile a bit lower.
;The ceiling is too close.