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[FearfulJesuit]

To get between Z-levels, I dig up-down staircases. Recently, I found a cavern. Basically, if we're looking at a cross-section of the cavern:

XXX
...
...
...
...
777

In other words, there's empty space between my stairs and 7/7 of water. I need to be able to build something underneath the stairs to prevent creatures from flying up into my staircases. But I can't figure out how...

[Triaxx2]

Knock out the stairs on either side, build walls, then break out the center stair and build a floor. Problem solved.

[Sphalerite]

If you build up-stairs over the up-down stairs you've carved out, that should block creatures from entering from below.

[khearn]

I just build a floor hatch at the bottom of the stairs and lock it. I usually explore downward with a single square of stairs, so I have to dig one space out to the side for the worker to have room to install the hatch.