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I took as granted that Miners always detected damp walls and stopped mining in these cases.

But a miner did not detect, or just decided to ignore, an obvious damp wall, and created a leak that led to a massive flooding of the Fortress.

How is this possible? As most strange behaviors on Dwarf Fortress are not bugs, but purposely programmed by the developers, I would like to understand the factors that leads me to not trusting my Miners common sense anymore.

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Version: 0.50 (Steam).

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    "trusting my Miners common sense " That's your first problem :) Commented Apr 27, 2023 at 10:44

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Assuming that it works the same as in the ASCII version: only newly discovered damp tiles cause dwarves to cancel mining. If you tell them to mine through a tile that you already know is damp, they do it. The game assumes that you want to deliberately mine into the river and flood your caves.

In the linked question it was clarified that this is an above-ground river (viewed from underground). The river was revealed since the start of the game, and so were the damp tiles around its edge.

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    Yes, it works the same as in the ASCII version. This is why nothing beats constant vigilance and checking their work over and over. Commented Apr 27, 2023 at 10:32
  • @Revolver_Ocelot Technically you just have to be vigilant when designating tiles to be mined. Commented Apr 27, 2023 at 17:57
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    @FedericoPoloni Do you want floods? Because that's how you get floods. Tiles can become damp after you designate them for mining, for reasons unrelated to that project. And in case of revealed tile becoming damp, it does not cancel mining designation. Commented Apr 27, 2023 at 18:10
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    Oh interesting, dampness is checked at designation (even on unknown tiles), not at the moment of actual mining? Oof. Commented Apr 27, 2023 at 20:22
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    @FedericoPoloni designation cancellation happen when previously hidden tile becomes visible and it is damp/warm. If tile is already visible, designation won't be cancelled in any case. I learned this the hard way after digging throug wall which led to the hidden part of the caverns which I flooded several minutes before that. Commented Apr 27, 2023 at 21:42

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