Hello there,
This is a rather odd problem. I had a fort that got run over by demons, I tried reclaiming it, got 70 dwarves with me and succeeded in cleaning out the fortress. This was at a terrible cost though, half the dwarves died and the other half were so miserable they eventually descended into madness. I tried reclaiming it again but got the same tantrum spiral from dwarves dying at the hands of batmen, giant cave spiders and whatnot. So with one of my last sane dwarves, I walled off the only stair leading down to the catacombs of my fortress (two very heavily dug out low z levels including the pits, where most of the monsters were), so that the next reclaiming party would clean up the place easily. I thought that I would take ridicilously good care of my dwarves and send them down into the bad parts when everyone was ecstatic and had plenty of good stuff to keep their minds occupied.
This went well and my dwarves are happily running around doing their jobs. But I couldn't see any of the corridors below the walled off stair - I assumed the game would treat them as a hidden cave. So finally I was ready to deconstruct the wall and head down to the pits again, but when the wall was deconstructed there was.. nothing. I could see the down stair that was under the wall, but to the left of the stairs were only black space instead of walls, and on the z level below the down stairs I couldn't see anything. Thinking that I may have to dig into the "cave", I tried digging into the catacombs from a different direction, but when hitting the previously dug out corridors, my miners refuse to dig, giving me the reason "Canceled digging downward stair - Could not find path".
This is what it looks like. The parts that are black in the middle of my designations are where I ordered an up stair to be dug (there is a down stair above it), and I know for a fact that I had a tunnel there before.
I hope that I'm making the problem clear, although it's quite hard to explain. To put it simply, I get undiggable black space where there should be a gigantic system of tunnels dug by previous owners. Does anyone have any idea what causes this and what can be done? I want to get back to my sweet, sweet adamantine
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Topic: [40c] Reclaiming walled off part, undigable black space? (possible spoiler) (Read 2091 times)