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[ragincajun]

I had a miner have an unfortunate accident while channeling out a space for a well.  This resulted in his plummeting downward and discovering he could not fly.  The 7/7 underground water did not cushion his fall and he had gone on to Valhalla. 

I'm attempting to gain access to his corpse for burial.  I've dug a stairwell down to the level above the water and then breached the wall 1 z-level above the wall and in that breach point, I've dug a downward staircase.  That stairwell has flooded naturally.  The corpse is four squares away from the stairwell.  It's not appearing as though anyone can/will retrieve him.  I have made a coffin, placed it and designated/assigned it to the corpse.


77777
7c777u<----- c is the corpse location; u is the upward stair location
77777

I've attempted to build walls or floors to no avail.

[PatrikLundell]

The only way to get the corpse out is to lower the water level all the way to the corpse, as the corpse hauler has to stand in the corpse's tile to pick it up. I think 3/7 is sufficient, but if waves cause ripples up to 4/7 you'll probably get retrieval cancellation spam.
Fighting with one (or better, several) screw pump(s) could work, but the pumpers will probably be swept down into the water unless the output is contained. I haven't been too successful with open water screw pump usage, though...

[BadLeo]

^This, or just memorialise the wannabe-flying miner and let his corpse where it is.

"Oi, that be me lucky day! Went to the well to the seasonal bath and the bucket brought me a sock. It's a really nice sock, indeed!"

[Dozebôm Lolumzalìs]

If the water is a cavern lake: Does said water reach the map's edge?

Spoiler: Yes, I can't see the edge of it, no matter how far I scroll. (click to show/hide)

You cannot retrieve the corpse, unless you are a master player very good with pumps.  You would need several pumps, powered by perpetual motion machines, constantly draining the area so that a brave dwarf can retrieve the corpse.  If the cavern lake is multiple levels deep?  Let's just say...  Go engrave a slab. 

Edit: Come to think of it, you could cave-in a ring around the corpse and pump the water out.  Once you add staircases, you could reach the corpse.

Spoiler: No, I can see the edge. (click to show/hide)

See the answer for "No, it's a dwarf-made room."  However, it might be a bit more dangerous, so if the lake is small enough, you might consider sealing it off with walls and/or floors.

If the water is NOT a cavern lake:

Spoiler: No, it's a dwarf-made room. (click to show/hide)

Drain it, either with pumps or by digging a drainage tunnel to somewhere else.  To avoid yet another miner's death, first dig a tunnel from your fortress to the watery grave, but don't dig through the wall!  Then dig one tile to the side of your tunnel, like this:

Code: [Select]

WWWWW≈
WWWWW≈
____W≈
WWW_W≈
This will allow you to channel out the last floor of the tunnel while still allowing access:

Code: [Select]

WWWWW≈
WWWWW≈
___CW≈
WWWWW≈
Then, on the next level down, dig a large room (the larger the watery grave, the larger the drainage room you will need):

Code: [Select]

WWWWWWWWWW
W________W
W________W
W_______RW
W________W
W________W
WWWWWWWWWW
Once it has been dug, cover the hole to the large room with a floor grate, producible at a Mason's Shop, and put a door in between your fortress and the drainage channel, probably in the tunnel.  (Just for safety.)Once all that has been completed, send a miner to dig out the last tile!  Once it has all drained away, you can retrieve the corpse.  (If the watery grave is extremely large, it might be easier to dig, instead of a drainage room, a long tunnel to the nearest map edge, and smooth the undiggable tile.  After that, engrave a fortification.  You now have an infinite drain!  Better smooth/engrave a few more, just in case you need extra drainage.)

Hope you like my answers!

EDIT: Made some changes, added an idea, not necessarily "master player" to be able to do a Mosus Moses.

[PatrikLundell]

I don't consider myself a master player, but sealing a cavern lake that's a single level deep isn't too hard, although it can be time consuming. Multiple tiles deep is harder. My two main methods are magma and cave-ins, where the latter can have disastrous effects if the lake floor is the roof of something (e.g. the next cavern down, another part of the same cavern, or the magma sea). Cave-ins may not be possible if there is no room for the digging required because caverns are too close together.
Magma can be delivered either via a pump stack or a carried magma proof mine cart (steel, iron, or candy. NOT nether-cap, as it will be destroyed).

I did get the impression the well was in an aquifer, however, and that requires a fair bit of work.
- Puncture the well from below and drain it. That should allow you to get the body swept down. You'd then close the puncture with e.g. a drawbridge when the body has been swept down. Actually, you should be able to use that method with a lake as well (unless it's directly on top of the magma sea).
- Seal the well off using the double-slit method (modified for the circumstances), the cave-in method, or magma and then pump the water out.

[Dozebôm Lolumzalìs]

Ah.  I did not think of either sealing off the lake as a whole or the potentiality of the well being an aquifer well, nor did I think of sweeping the corpse away with pumps.