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These are styrofoam cups that've been crushed by the pressure at the bottom of the ocean. The water isn't looking for your nose, it'd just crush your outsides into your insides until you hit a relative density, like the cup, but not as pretty. The air in your lungs would instantly compress and heat to several thousand degrees C, turning your insides back into your outsides. I think.
I wonder if this is truly correct. By default human body is mostly water and made of things deniser than water. If water rapidly flows into the submersible, that might compress the air inside and cause the lungs to explode basically from the pressure differential in the chest cavity? Styrofoam in contrast is less dense and compressible.
You can take this with a pinch of salt, but I believe that, based on your mention that the human body is mostly water, our bodies, down to our last cells, also have this internal pressure from the water in our bodies. The water is not compressible, but tissue is. And that would mean that not only our lungs will explode, but our entire cellular structures. It would be like squeezing oranges or lemons
But tissue is mostly water with some solutes and a lipid membrane. I don't think the cellular structure would implode... It's malleable enough... There are gelatinous animals in the deep sea with cells and such. But any cavity would implode. Lungs, thoracic cavity, digestive system, abdominal cavity, even the small pores in your bones if they aren't packed full of equally dense liquid (not sure on this). The thoracic and abdominal cavity and pores in your bones are technically fluid filled... but since it's not as densely packed as it would be under pressure at that depth, I think it would still get crushed. I think the difference between this and the cells is the rigidity of the structures. Cells can shrink decently well under pressure and then equilibrate via osmosis. Cavities and bones can not.
However, your cellular structures (proteins and such) are probably fucked. They are super fragile and need very specifically equlibrated environments to survive.
But this is just all me postulating.
Ah okay that makes sense.
Do take what I say with a grain of salt, but my late night napkin math says that (assuming a now rectangular human that's 16 inches wide and 72 inches tall) a person should have a frontal surface area of 1100 inches, under 6000psi, that'd be about 6,800,000 pounds of pressure on them - instant death.
Holy shit and all of that happens within 2 nanoseconds I think? So that's why the victims in that submarine wouldn't even know it already happened because our brain takes 4 nanoseconds before we could process that pain.
The velocity of a catastrophic implosion like that would exceed Mach 2 (686 m/s). Nerve conduction is about 50-60 m/s. Dead before they knew anything was going wrong.
More in the range of a couple of milliseconds. The fragments of sub wall have to accelerate from zero over a distance of maybe 30cm before they hit a person (obviously depending on where the person is inside the sub).
Too fast to register mentally or even catch on standard video equipment in either case.
There's a big chance they've all passed out from lack of oxygen by the time this happened. It's instant death either way.
But look at that cup on the top right, not all of them got crushed.