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What's the "safe" to dig a vertical pit?

I tried to channel a 3x3 section straight down. I also put in an up/down stair on the side of the pit but my miners ended up getting stuck, dieing of thirst, and falling and breaking their ankles.

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Just because I'm such a pedant: Isn't "vertical" kind of redundant? On account of no one ever digging a horizontal pit, I mean. :) – Williham Totland Sep 9 '11 at 21:36

In my experience, the safest way of doing it is to designate one level for channeling at a time, waiting for the previous one to be completed before you continue.

It requires a bit of micromanagement, but it generally works pretty well, and as long as you have a maintenance chamber at the bottom, you generally don't need the up/down staircase.

Of course, Dwarf Fortress isn't exactly a bastion of OSHA compliance, and mining is a cheap skill to train, relatively speaking, so safety can in many cases be favorably sacrificed for speed.

That said, the absolute fastest way, so long as you have access shafts on each Z-level, is to dig each level, then build a constructed floor above in the shape of the desired pit that is subsequently collapsed using a support.

Just make sure that the pit has solid ground underneath…

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I lost my OSHA rating when my last Mason starved to death on top of the archer tower... but he did good work. He got a nice burial. – Randito Sep 9 '11 at 21:31
@Randito: How'd you get him down? – Williham Totland Sep 9 '11 at 21:32

Digging a straight up/down stairway is dangerous, because, if any dwarf happens to fall, they'll fall all the ways down, ending in a bunch of red ² at the bottom. And everybody know that crushed dwarf is hard to clean.

I would rather make your pit with an alternated staircase on the side, like this:

HHH   level Z=0

HHH   level Z=-1

Like this, if a miner happen to fall, he will just for for one stair, much less dangerous.

Also, you can dig your staircase first, it won't matter, but make sure to pit the pit from top to bottom, a floor at a time. Since channel automatically create a ramp on the floor below, your dwarves won't get stuck if they happens to fall while digging, if the floor below have not been dug at all.

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Dwarves only fall down staircases if they happen to collapse on the stair cases, and they usually won't fall all the way down, only a few floors. – Ullallulloo Sep 9 '11 at 19:55

If you are digging to a cavern for a well or something, remember to build an artificial floor(b-C-f) under the shaft first to "catch" your miners. Just deconstruct it slowly to prevent cave-ins. Also, digging a 3x3 shaft one one-block-wide shaft at a time can be helpful to prevent starvation/dehydration if it's deep.

If you're just digging a pit somewhere else for some other reason(execution?), dig the stairwell first, and then dig the same one-block-wide shafts starting from the stairwell to make sure that your dwarves don't decide to dig all the far away blocks first and then starve/thirst themselves to death.

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