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[MetalSlimeHunt]

It seems that a good deal of demons are both magma and water invunerable. They might be vunerable to ice, but this is moot as your plan involves dropping it past your world's mantle and into hell. Even dwarven physics can't make that work.

[Apegrape]

It seems possible, but it's FUCKING HARD. You'll have to dig away all of the rock, earth and other caves and then dump several thousand tonnes of water onto demons that are trying to kill you.

Unless temperature is "fixed" so that the cold just dissipates on its way down.

[Kaolix]

I can think of a safe way to do it without having to really face the HFS before insta-frosting them.

Basically, dig your giant hole down as far as you can be sure is safe, first, but leave a cap on top of it, and a floor at the bottomost point you are certain is safe. Then, flood this tube. As it has a cap on top, and is still technically 'underground', you should be able to fill it with unfrozen water. Next, continue digging one z level below the floor of your tube, and be prepared . . . you should now have a system that looks like this: (Side View)
-----------------
############
#WWWWWWWWW
#WWWWWWWW#         - = Open Space
#WWWWWWWW#         W = Water
    .                             # = wall
    .                             D = Urist McMiner
    .
#WWWWWWWW#
############
#--------------#
#---------D----#
############
#HFS somewhere#
#under here       #


Now, as soon as you notice that you have reached the HFS, mine out the edges of the cap on top of your water column. With luck, the central portion will cave in, smash through the 'floor' a few layers above the HFS, and then smash through the ceiling of the HFS itself, opening it up quite nicely. Water should now flood in, and then freeze.

The only problems I forsee with this would be the time it takes to mine out the edges of the tunnel's roof. But that issue can be solved by building a second floor above it, suspended on one support which has a lever to activate it - as soon as hfs is breached, pull lever, boom and frozen hell.

[Rumrusher]

once you freeze it over best grap a pick and make a fort down there.
I don't know if smoothing slade makes it digable or just building a floor is the only way but I would love to see a trade/raiders try to get me under ~150z levels.

[EliDupree]

I can think of a safe way to do it without having to really face the HFS before insta-frosting them.

(description of the idea)

Won't the column of water freeze before it falls? And even if you can work around that, won't you end up with an ice plug that prevents you from filling the rest of hell? I think you need to flood it first, and only then expose each column to the upper air (which probably requires draining the great magma sea, too!)

[Bauglir]

-snip-

[Ryko Nailo]

I already had an exploration shaft go down ahead of time to find the magma ocean and the pillars of adamantium. Since there were several I just picked one and started digging a perfect copy of the column down from the surface. I'll probably try multiple approaches each on each of the columns. I have a massive aquifer which thankfully is providing a ton of unlimited water and since I'm in a freezing biome was easy enough to dig thru.

But definately good points both for and against the massive pillar of water strategy. I think I'll attempt that on the second on but for the first I will simply dig out probably a dozen or two whole z levels and let them fill with water, all having many floodgates that open to the shaft to hell that hopefully will fill it fast enough. The trouble as has been pointed out and as I've learned trying to fight batmen sabotaging my shaft construction is that I need some way to kill these demons fast. Even with dozens upon dozens of waterfalls I doubt it would be fast enough, especially since it would have to fall hundreds of z levels. I do like the cause a cave in to smash the demons idea but then I'd have to go to hell to clear the rubble out of the way. I think I'll have to leave a cap somewhere in the shaft to prevent the water from freezing up in the pillar now that you've pointed it out though.

As for draining the magma sea, wouldn't simply dumping an even larger amount of water on it turn it all into obsidian which I could then mine out?

[lastofthelight]

This would make a great community fortress. A military expedition from the far corners of the dwarven empire. Each man knowing that they will surely die....only to be replaced by another expedition, again and again....

[Pilsu]

Personally I'd try to sort out the initial demon onslaught with a giant ice spear being dropped down a shaft into hell.