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[Pvtbones]

so I embarked on a half joyous wilds half haunted(or the other evils) embark (in .21, just switched over) and everything was going swell digging out the basics of my fort, I randomly notice theres a deceased cave dragon on the unit list and then about ten minutes later I start getting constant pause alert spam of a section of cavern has collapse.

there is an aquafier on this map.

any ideas on what could cause this (and will I have a flooded/ dead) cave?

[Flare]

I get this too every time I load my fort, it's in the caverns and it's always a piece of loose loam it seems.

[Jelle]

I have the same problem increasingly often lately. The game will usually crash for me several minutes later.

[Dorf3000]

Ok I'm going to use my psychic powers to predict what you will see when you dig into the caverns (or use dfreveal):

1. The aquifer is leaking into the top cavern in one or more places.
2. This leak is filling up the lower areas and there is a drowned cave dragon corpse somewhere.
3. You have a magma pool up in the top cavern, and the water is flowing into that and bits of obsidian are causing cave-ins.

I would try turning off cave-ins in the init text file for a few seasons until it's covered and no more will fall in.  You'll have lots of Fun trying to stop it leaking and get the cavern back

[Cotes]

Use DFreveal to figure it out.

[Pvtbones]

so little bit of an update since after I posted.

I managed to dig down past the aquafier and I ran into warm stone a couple z layers under the entrance section of my fort (all I have is the entrance portion and the stockpile level above it with a farm)

I dug a channel and what do I see...

Spoiler (click to show/hide)

magma sea

I don't really know what to do, I've never really got a fort to this area before..

will try and get pics later.

[krenshala]

that would definitely account for the cave ins ... water getting into the sea, forming obsidian, which then "falls" to the bottom of the magma sea in a "cave in".