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[DKS]

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on the z levels above and below the obsidian are magma.

More can be placed on top of what I have there via obsidian casting. Next time I just have to make the base wider so I actually have room for a fully functional fort.

[Eagle_eye]

so basically you sent water down, rather than obsidian?

[Dante]

I've got another idea. If you made a t shaped obsidian block like this: ===||===
                                                                                                   ||

and you put a launching platform beneath it, not as wide as the "t" part, wouldn't it snag on the platform, with the lower levels beneath the magma?

Nope. Things fall as far as they can. You'll get a two-, and in some parts three-layered obsidian carpet.

Edit:

It worked!

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on the z levels above and below the obsidian are magma.

More can be placed on top of what I have there via obsidian casting. Next time I just have to make the base wider so I actually have room for a fully functional fort.

WHoa. Please explain how you did this (didn't really get your explanation on last page, I thought it wouldn't work) - this is what we've been trying to do for the last fifteen pages!

[Eagle_eye]

I think he somehow cast it inside the magma sea, rather than dropping it into it.

[Dante]

But if there's a dwarf in there, and he didn't use the hammer method...

wait, was the magma drained or something?

[Eagle_eye]

maybe its a giant obsidian tower extending to the surface?

[DKS]

To start with I dug out a huge room above the magma sea. I then channeled out the floors and I dropped water from a chamber I had setup above it.

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This is before I ended up expanding it but it gives you the idea.

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The empty space has a bunch of floor hatches attached one of the levers and the other two levers deal with putting water in the room. You could also replace the floor hatches with a retracting bridge or just dump the water directly in. My setup resulted from trying a bunch of crap.

Drop the water into the magma and a square of obsidian forms on the z level below. Which I open to the magma below with placing up/down stairs so the water can go through and form another square of obsidian.

If you still aren't getting what I'm saying I'd suggest looking at the wiki's article on aquifers because similar principals apply for getting through them. http://df.magmawiki.com/index.php/DF2010:Aquifer

Once I get near the bottom I use the uneven magma sea floor for support. As magma flow tiles (the floors created on the z level above semi-molten rock) provide support to tiles next to them.

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Then I just channel out the cone down on my way up. Leaving the lowest z level which is now supported from below by SMR rather than by above.

[Metroid]

I feel like everyone is just trying this out now. Congratulations on winning my internets for the week.

[DKS]

I feel like everyone is just trying this out now. Congratulations on winning my internets for the week.

I'm included in that group. I set the one I used here in an off fort to test if it'd work. I'm now putting it into my main fortress.

There's nothing more dwarfy I can think of than a fortress under the magma sea.

impractical, check. impressive, check. involves magma, check. high chance of ending horrible Fun, check.
We just need a way to kill elves while we're at it.

[Dante]

maybe its a giant obsidian tower extending to the surface?

Ohhhhh, it's this.

Once I get near the bottom I use the uneven magma sea floor for support. As magma flow tiles (the floors created on the z level above semi-molten rock) provide support to tiles next to them.

Then I just channel out the cone down on my way up. Leaving the lowest z level which is now supported from below by SMR rather than by above.

I thought you'd actually managed to drop a dwarf in a bubble, completely sealed off from the surface, as part of the whole thing. 

But that's still pretty cool, and that's valuable information about the magma flow tiles (we concluded it was impossible before as semi-molten rock destroys terrain you drop on it).

[Rolan7]

When I tried dropping an obsidian "bowl" into magma in the arena, with a bunch of creatures in and above the water, it seemed that the creatures didn't even start falling until the bowl fell and the obsidian cap formed.  In retrospect this makes sense: cave-ins have always seemed instantaneous, while creatures can take many clockticks to reach the ground.

A lot of what's been posted here I don't understand, but it seems impossible to drop dwarves into magma and end up with them encased in a protective shell of obsidian.

The hammer method looks good though: http://www.bay12forums.com/smf/index.php?topic=56305.msg1237578#msg1237578
I may give it a try.  I've got an idea for a twist, too.

[DKS]

I thought you'd actually managed to drop a dwarf in a bubble, completely sealed off from the surface, as part of the whole thing. 

sorry but I don't think we'll be able to just drop blocks down and have it work in this version.

Though if you manage to setup some pumps that drains any magma flowing in from an opening to above you might be able to drop a dwarf down in on to a kitten as I believe I remember hearing that dwarfs wouldn't be hurt by the magma as they fall. I have yet to test that the magma wouldn't hurt them though.


Also, another way to have an undermagma fortress besides going all the way down could use the aquifer bypassing method that my original way did but use supports instead. So you would not have to go all the way down or have to have an uneven part of the sea floor.

[jokermatt999]

This is a long and unlikely shot, but what happens when a cage linked to a lever falls? My guess is instant deconstruction, but it would technically be a way to drop a dwarf, alive and whole to the bottom of the (magma) sea. They'd be in statis with no chance of release, but alive, right?

[Eagle_eye]

I believe the SMR would either destroy the cage, or else the magma would. magma safe cages, I don't know.

[Kadzar]

Cages may not be viable for the first Dwarves you send down, but they could be used to transport additional personnel to your submagmatic base.

 Now I'm wondering if barrels made of magma-safe materials could be used to safely transport food and booze.