: This message appears when trying to mine too far under the water table.
: Also occurs when trying to open a tunnel in which the northwest corner of the tile being mined is at or more than 12 dirts below the water table.
; The roof sounds strangely hollow. You must mine the other corners if you want to create an opening.
: This message appears when mining a cave ceiling to the outside tile corners height.
; The roof sounds dangerously weak and you must abandon this attempt.
: This message appears to indicates the rock layer above is very close to the ceiling, so there is no more room to mine further.
; The rock sounds hollow, you will need to tunnel to continue proceed
: This message appears when trying to [[surface mining|surface mine]] above an open tile underground, and you are already at the ceiling height of the mine.