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[MrWillsauce]

If you're trying to send a bunch of brave dwarves to the bottom of the ocean or into a volcano, everyone knows that 4 walls, a floor, and ceiling won't work as a submarine. The Ceiling will connect with the floor, crushing the dwarves and flooding the capsule with water. I had an idea: if instead of just having the ceiling just be a bunch of stone tiles, what if it were a hollow vessel full of magma? If the magma was configured in the prefect way would it be possible to cool the magma with the ocean water just at the right time to seal the roof? Now I am disregarding the survival of the dwarf divers for now, this is just way to try and get a submarine into a body of water without it completely flooding. Please tell me if this could work and requires further science or if you know it isn't possible. Also are floodgates automatically dismantled if they are involved in a cave-in?

[MrWillsauce]

I'm assuming the magma will just cool at the surface of the ocean.

[GenJeFT]

Ive tried this already with my lava submarine experiment.

The entire capsule will just fall into a pile of rubble.

On the bright side someone made the attempt into a great song.

[MrWillsauce]

I had a map with tons of gold and I started construction of "Operation Yellow Submarine" to turn my nobles into brave magma submarine sailors while paying homage to the Beatles. Things didn't turn out though... (Tantrum spiral).

[Five chickens]

Were you trying to literally build a submarine that could propel itself, or some sort of station?

[MrWillsauce]

Were you trying to literally build a submarine that could propel itself, or some sort of station?

The goal is to get a dwarf from the surface to the bottom of a body of water without flooding the vehicle with water or crushing the dwarf. No propulsion is necessary (although that would be extremely impressive/impossible).

[Eagle_eye]

This has come up many times before. I believe it was ruled impossible to build a submarine because floors/walls with no wall under them will always fall down as far as they can. However, if you can find a spot without SMR, you could be able to build a solid pillar all the way to the surface via obsidian casting and then dropping massive slabs, and then channel out your submarine from that.

[MrWillsauce]

However, if you can find a spot without SMR, you could be able to build a solid pillar all the way to the surface via obsidian casting and then dropping massive slabs, and then channel out your submarine from that.

It's not the same 

[Pyro627]

This has come up many times before. I believe it was ruled impossible to build a submarine because floors/walls with no wall under them will always fall down as far as they can. However, if you can find a spot without SMR, you could be able to build a solid pillar all the way to the surface via obsidian casting and then dropping massive slabs, and then channel out your submarine from that.

Didn't someone manage to pull it off with a submarine shaped like a T?

[MrWillsauce]

Didn't someone manage to pull it off with a submarine shaped like a T?

I don't so how that would work any better than a box, but if you can find a link that would be awesome.

[Eagle_eye]

As I recall, the T shape failed and the central column disconnected from the sides.

[MrWillsauce]

Hmm... now I really want to read that thread.

[OcelotTango]

If I recall correctly any constructed wall will deconstruct immediately upon being dropped which is why trying to just build a capsule wont work. However natural stone does not do this (cave in traps work because of this), so you have to carve / cast a submarine, and then comes the hard part about keeping the ceiling of the capsule from caving in, and flooding the chamber with magma. I wonder if mine carts occupying a block will keep a ceiling from collapsing.

[greenwatering]

even a ceiling made of one layer thick natural wall will collapse.
natural walls disconnect from one another and fall as far as they can so it is impossible to preserve open space in a falling piece of anything.

[Five chickens]

Maybe someone should head to the suggestions thread, and propose introducing bouyancy to building materials.