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[Iron Bird]

So, I've started a new fortress to practise breaching aquifers, and after some tries, everything went smoothly, untill I dug the second layer into my 'plug', where suddenly the water was present again, while I am quite sure I have made more than 2 levels of earth fall into the gap. Here are some screens for your help:
The upper level, nothing to note here.

One level below that

Another level below. As you can see, here the earth entered the water. I can make a downstair into the earth.

One level down everything seems well too, I am perfectly able to dig an up/down stair

When I try to make an up/down stair a level below, I notice this is suddenly damp stone. When the stair is digged, it's clear this is 7/7 water.

And just as I thought I couldn't do anything here, one level below, obviously hindered by the water.


I'm clueless, any help would be much appreciated!

[SRD]

channel and re-breach

[Iron Bird]

You mean do the same thing again? Already done, same result.

[khearn]

If I'm understanding you correctly, you've got a multi-layer aquifer. If you want to use the cave in method, you've got to start with a bigger square, so you can do anther cave in through the lower layer. And there might be another level under it. I've read of aquifers 6 or more layers deep.

Try the two-slit method linked to from the bottom of the aquifer wiki page. It will go through any depth of aquifer without requiring advance knowledge of how deep it is.

[Iron Bird]

Well, the thing that confuses me is that even though 2 z-levels went down into the aquifer, I could just dig 1  level down and then I hit water.