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[LordFerrok]

Would it be possible to build a large multi-building habitat connected to walkways above the water, fill it with all the dwarves will need, get them all inside, and sink it to the ocean floor? Or would it result in something fun like the buildings breaking open and drowning all the dwarves?

[Urist Da Vinci]

Would it be possible to build a large multi-building habitat connected to walkways above the water, fill it with all the dwarves will need, get them all inside, and sink it to the ocean floor? Or would it result in something fun like the buildings breaking open and drowning all the dwarves?

The building, and all the dwarves, would end up as a paper-thin smear on the bottom of the ocean. All the items and junk would be scattered around the seafloor.

You have to do something like drain the ocean, build on the sea floor, and then let it flood again.

[LordFerrok]

ok, why would they all die in horrible crushing oblivion?

[Fnear]

When constructed structures collapse, they deconstruct.  So if built from constructed walls and floors, you'd get a pile of stone.

When natural rock structures collapse, they collapse as individual cubes of material.  So you'd end up with a solid structure where all of the internal cavities were filled by whatever was above them.

I use that property to create nice flat expanses of "surface" much further down by digging out a mirror of the surface topology so that when it all falls, the hills will fall further and the surface of the collapsed expanse will be flat.

[caddybear]

You can do anything with enough pumps. And slave labor.

[StLeibowitz]

Unless some idiot has organized a party.

[dizzyelk]

You can do anything with enough pumps. And slave labor.

Just expect FPM (frames per minute) when the pumps to empty the lower level of water come online. The current underwater fortress I'm working on now is about complete after 9 in game years spent stripping a giant hole in the land that I'm building it in, as well as waiting for my masons to create all the blocks I need.

[LordFerrok]

so i would have to wait till winter then tunnel up? also, can you get dwarfs to fish the ocean?

[GoldenShadow]

You could cast a solid obsidian dome above the surface of the ocean. When its done, collapse it into the sea floor, then connect to it and hollow it out with miners.

[LordFerrok]

OBSIDIAN  YOU WOULD DARE TELL ME TO SPOIL MY BEAUTIFUL UNDERWATER PRISON RESORT WITH A VIEW OBSTRUCTED BY THAT BLACK STONE!!!!!! IT MUST BE MADE OF GLASS WINDOWS AND WALLS

[jcnorris00]

No, no, it's just temporary.  Cast a huge cube of obsidian, one layer at a time.  Hollow it out so that a one-block-thick wall is all that's holding back the water.  Then build your glass dome however you like.  Once you're done, undermine the obsidian seawall so that it collapses completely into the sea floor.

[LordFerrok]

No, no, it's just temporary.  Cast a huge cube of obsidian, one layer at a time.  Hollow it out so that a one-block-thick wall is all that's holding back the water.  Then build your glass dome however you like.  Once you're done, undermine the obsidian seawall so that it collapses completely into the sea floor.

how do i undermine only the obsidian and not the buildings (domes are boring)

[AbacusWizard]

OBSIDIAN  YOU WOULD DARE TELL ME TO SPOIL MY BEAUTIFUL UNDERWATER PRISON RESORT WITH A VIEW OBSTRUCTED BY THAT BLACK STONE!!!!!! IT MUST BE MADE OF GLASS WINDOWS AND WALLS

Obsidian is a form of glass. You'll be fine.

[GavJ]

No, no, it's just temporary.  Cast a huge cube of obsidian, one layer at a time.  Hollow it out so that a one-block-thick wall is all that's holding back the water.  Then build your glass dome however you like.  Once you're done, undermine the obsidian seawall so that it collapses completely into the sea floor.

how do i undermine only the obsidian and not the buildings (domes are boring)

He means that you would carve out the ceiling of the cube too, so it is just 4 straight walls in a square, holding back the ocean.  Then youd collapse it by digging a wall height hole under the wall and collapsing it so it slots in perfectly.

Honestly, I think draining the ocean with a bridge (tells you how on the wiki) and some pumps to the map edge i way the hell easier.  <1 year project to do that

[LordFerrok]

OBSIDIAN  YOU WOULD DARE TELL ME TO SPOIL MY BEAUTIFUL UNDERWATER PRISON RESORT WITH A VIEW OBSTRUCTED BY THAT BLACK STONE!!!!!! IT MUST BE MADE OF GLASS WINDOWS AND WALLS

Obsidian is a form of glass. You'll be fine.

Volcanic glass, its opaque, not clear, how am i suppost to impress upon my prisoners guests the futility of escape into a hostile ocean how beautiful the ocean is, if they cannot see out?