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I don't know how I managed it, but somehow when I was constructing a staircase, I left a big hole in the floor that opened up into the top of a cavern, and didn't notice. The only real impact was that from time to time a bugbat would fly up and wander in, and I would find a loose bugbat mucking around in the lower levels of my...

So. It was in the early hungry days of my fortress, when the military is half a dozen guys with wood crossbows who can't shoot, when everything is big mining and grand plans and challenges of lacking basic infrastructure, and no unpleasant memories walled off forever in some secret corner of the fort. That, and realizing there's...