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23a:Cave-in
| This article is about an older version of DF. |
- A section of the cavern has collapsed!
A cave-in is what happens when there are no walls or supports in a section of cavern 7x7 or larger. Mining out an overly large room will not result in an immediate cave-in - the room will appear to be stable, but after about a week and a half it will abruptly collapse. If a support holding up a 7x7 section is triggered by a lever or pressure plate, though, the cave-in is immediate.
If your fortress contains any rooms with unsupported ceilings, the message "You hear a deep rumbling coming from the cavern." has a chance to appear several days before the cave-in occurs.
A cave-in produces a dust cloud which knocks dwarves unconscious, as well as several tiles of unmined rock (with varying levels of damage, similar to that from mining) such that there are no longer any 7x7 unsupported areas.