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[The Yellow Peril]

Try caving in something with Stonesense to get a feeling for why it doesn't work. What happens is the whole construction is deleted from the game strip by strip, then once this is done, everything which was inside the caving-in-building is dropped from the height it was originally at, and all of the stones which made up the building are placed tile beneath the whole construction, + a corresponding amount of dust is spawned, and these then fall until they hit something. The whole process is entirely unrealistic, and just not designed to be so.

[Terisuke]

Yeah, I just tried dropping a box of magma, and you can see the results:



Before a frame has passed, the stones are on the ground, while the magma hangs in the air in its boxy shape, emitting lava mist properly due to the rocks passing THROUGH it.  After I unpaused, it fell normally.  The fall speed of constructions or living rock is essentially infinite, and the fall speed of everything else is not. 

[Noble Digger]

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.

This. Since staircases are passable but count as a supporting tile, you just have to make sure any negative space is a staircase rather than mining it out. However, you should know that the dwarf will still be HORRIBLE MURDERED because of the collapse debris, fall damage, and complications arising thereafter. Even if he somehow lives he's probably XX!!Crippled!!XX (yes, somehow he's on fire as well)

[Dante]

This thread has been done before, big time.
http://www.bay12forums.com/smf/index.php?topic=56305.0

In fact there is a way to drop a submarine into water: the hammer method. But it's a two-stage process, creating a docking tunnel that you can ferry stuff down through, then collapse and seal yourself off completely.

Success here:
http://www.bay12forums.com/smf/index.php?topic=56305.msg1260128#msg1260128
Using Keldor's second idea here:
http://www.bay12forums.com/smf/index.php?topic=56305.msg1237578#msg1237578