You can limit access to your mine with the use of a [[mine door]]. Several types of mine doors are available.
=== Tunnel excavation Excavation ===
Mining a cave wall inside a mine will create a tunnel further into the mine. It takes 45 mining actions to produce the message "The wall will break soon", after which it takes average 5 actions to open the tunnel.
There is no falling damage inside mines.
=== Tunnel Exits ===
*You '''cannot''' mine out from a tunnel if the tile outside has dirt on it.
*You '''can''' mine out from a tunnel if the tile outside is bare rock.
''Thanks, Kediec, for that info.''
=== Ore mining ===