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Digging designation canceled
This error message pauses the game and zooms to the location where the warm or damp stone was located.
Warm or damp stone is very dangerous as it indicates the presence of nearby magma or water respectively. However the stone could be warm/damp because the magma/water is beside the tile, directly above the tile, or directly below the tile - and most of the time you don't know which.
The safest thing to do is back off several tiles, mine up a z-level then approach the location again. Rinse and repeat until you emerge above the surface of the magma/water. Note that you will not receive warnings when digging staircases. If you plan on digging a staircase to a higher z-level, make sure there are no aquifers or magma in your way!
Side Profile:
Below tile Beside tile Above tile Key
####### ####### ####### # Unmined stone
↑ __o#### ####### ####### # Warm stone
z ###~~## _o#~~## ###~~## # Square that was just canceled
axis ###~~## ###~~## ###~~## ~ Magma
↓ ####### ####### __o#### _ Floor of the tunnel
####### ####### ####### o Miner
Only in the middle case would it be unsafe to mine out the square that had just been canceled: In the first and last cases, there would be a floor between you and the fluid.