DF2014 Talk:Cave-in

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130.211.0.79 21:41, 16 July 2019 (UTC) My dwarves had fun caused by a random cave-in that occurred in one of my soil farming layers. The area of collapse was a small room in the second soil layer beneath a river (in the damp soil tiles just below the river). This ended up flooding 8 rooms and at least 6 dwarves had some fun in the water. I had no designations there that would have caused this, and besides, if a dwarf had attempted to mine a damp tile, the game would have paused. I don't know if this is a feature or a bug, or if something was changed that nobody has been aware of. It does make sense for a soil floor to collapse if there is nothing underneath and a heavy river above, but as far as I am aware (and this article doesn't disagree) there are no random cave-ins, they are always as the result of a mined tile. I also was not currently chopping down trees (for maybe half a year or so). I just added it in as a warning not to dig in soil beneath rivers in case of cave-ins, whether it's a bug or not.

Thank you for your consideration. 35.191.2.80 02:46, 17 July 2019 (UTC) Found a random YouTube video that demonstrates a similar behavior with a single dirt floor under water.

That was likely an unsupported tree growing in midair then collapsing, Bug 9479. Leaving an intact layer between the surface and your fortress will prevent any collapses from breaking through and flooding your fortress.--Loci (talk) 16:45, 21 July 2019 (UTC)