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[noodle0117]

I've tried.
Doesn't work.

For those of you who are wondering what I'm talking about...

Concept of the submarine:The original purpose of the dwarven submarine was to make a miniature enclosed house-like building which, upon completion, will be dropped down a sea of water/magma. In theory, the submarine should drop to the bottom of the floor fully intact and there the dwarves inside will begin a self sustaining life free of goblin/enemy interference until migrants from above dig them out.

Well that's the idea anyways, but in practice, the roof of the sub tends to cave in crushing anything inside of it.
I've tried making the sub out of earthen dwarven constructions.
Roof caved in and killed all my dwarves

I've tried making it out of wooden constructions
Same result

haven't tried metal walls, but I suspect its the same result.

I've tried digging the entire sub out of natural rock.
Still didn't work

I've even tried using obsidian to "solidify" a sub out.
Nothing works.

adamantine "might" work, although I haven't tried it yet.


So all in all, dwarven submarine DOES NOT WORK.
 

Myth busted.

[thijser]

there is another way. simply make a tube upwards that's then used to enter the sub (you will have to hollow out the whole thing) when you are done you can start removing the tube.

[Urist Imiknorris]

Open ceiling?

[OmnipotentGrue]

Water, derp.

What about making the roof/floors walls? Same result?

[Grimlocke]

Well, knowing that caveins pancakes everything that caves in it seemed rather obbvious this wouldnt work. Adamantine wont work either by the way, material properties dont factor into caveins. The only difference there is that natural rock walls remain in tact after they cave in, while constructed ones just deconstruct. Buildings also deconstruct if their flooring falls to its doom. Dwarves fair even worse, even if the ceiling doesnt squash them the vicious cavein dust would just kills them.

So yeah every bit of the submarine fails to work right. Best you can do is cast a big pillar out of obsidian, plunge that into the sea and dig out a fortress in there.

Oh have you tried caging dwarves? You could make them glass terrariums, have them sleep on cage traps and bridgapult them into the sea. They will die of thirst though, kind of ironic.

[noodle0117]

there is another way. simply make a tube upwards that's then used to enter the sub (you will have to hollow out the whole thing) when you are done you can start removing the tube.

But upon tube removal, they still die

Open ceiling?

haven't tried that yet, although pretty sure it's not gonna work underlava

Water, derp.

What about making the roof/floors walls? Same result?

Only ceiling truly collapses.

[Loyal]

How is this news exactly? Things without a support fall through the air until they hit the ground, things falling do not fall intact, and water behaves like air when it comes to things falling.

[stolide]

I doubt this counts, but I did make a water tight, self sustaining, building in the bottom of a pit, and then flooded the pit. I even had a set up where the water levels could be lowered, and a tube with a draw bridge ontop would open, and allow access to the rest of the world...

On a related note, I saw someone post a gif of them making an obsidian sphere that floated in the water it was in. If one were able to make the inside hollow, that might work. http://www.bay12forums.com/smf/index.php?topic=62267.msg1426278#msg1426278

[Reese]

I heard that stairs carved from natural rock will remain intact in a cave in, so you could theoretically carve your submarine out of natural rock using up/down stairs instead of tunnels.

IIRC, someone tried to make something like that, and the stairs remained intact... but the dorfs inside still liquefied when it dropped.

I suspect that, due to the way liquids displace in a cave in, your submarine would end up filled with whatever you dropped it in anyway.

[Zebra2]

What about this in regards to preventing death of dwarves during the cave-in phase:

The module would be something like a cube. The floor and ceiling would have to be a least one z-level thick so that they don't collapse. The inner area containing the dwarves would be something like a 4X4X4 chamber. The important part is that there are a few z-levels between the floor and roof.

Now, we know that cave-ins are instant with regard to falling terrain. If you drop the vessel 50 z-levels, it will go straight through your dwarves, leaving them dangling in the air dead, where they were at the moment of collapse.

However, you could, in theory, drop the vessel incrementally, just a couple z-levels at a time. This would prevent the roof from going through your dwarves.

[Hyndis]

You need to build it inside a drydock, and then when construction is complete remove the drydock.

[Sphalerite]

However, you could, in theory, drop the vessel incrementally, just a couple z-levels at a time. This would prevent the roof from going through your dwarves.

Dropping any height will cause every tile of wall/floor/roof to detach from its neighbors and fall.  A single Z-level drop will turn the cube into a pancake.  That's just the way DF physics works, there's no way to maintain an open space in a structure when it falls.

[Zebra2]

However, you could, in theory, drop the vessel incrementally, just a couple z-levels at a time. This would prevent the roof from going through your dwarves.

Dropping any height will cause every tile of wall/floor/roof to detach from its neighbors and fall.  A single Z-level drop will turn the cube into a pancake.  That's just the way DF physics works, there's no way to maintain an open space in a structure when it falls.

I see. Has it been tested if natural stairs remain intact?

[iceball3]

how about carving out a bay without flooding it, stick constructions in th bay, then flooding it?

[Hyndis]

how about carving out a bay without flooding it, stick constructions in th bay, then flooding it?

You could even rig it in such a manner that pulling the lever would collapse the entire wall. Magma would then melt the remains of the wall away into nothingness.