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Water at that pressure do not act like a rigid falling at g, at that pressure is somewhat elastic; It acts like a compressed spring when its base fails and colapses, expanding very quick. The sub was crushed at a speed very close to the speed of sound on water IMHO.
@erebys21 Says:
As a cherry on top of the deathcake, wouldn't the higher pressure water rush into the 1atm water, dealing even more damage to the sub?
@FuS3D86 Says:
Is the solution for melting ice caps, digging a big hole?
@register1430 Says:
When this originally happened I saw the joint fitting clip and knew right away, hand mixing an adhesive? Under these extreme conditions? And NO bolting of the metal to the carbon? Home depot Solution.
@seancsnm Says:
Why would you even build a carbon fiber hull instead of steel? Weight isn't an issue which only leaves cost/strength as a factor. I thought carbon fiber was more expensive than steel.
@MrBusunglueck Says:
LOL nice eastereggs @15:16
@carlosvasquez9890 Says:
This guy is the personification of Kruger Dunning effect 😅
@ArchangelExile Says:
15:11. 😏🍆
@shadowcult464 Says:
Rethinking the accident into an innovation:
Deep sea thermal vents (high pressure high heat) are a great combo for curing carbon fiber resin epoxy.
Only cost effective for mega size manufacturing.
Requires a powdered heat activated resin epoxy with no solvent ; to prevent curing until it is at the thermal vent (this technique requires a "boiling bag" containing nothing that off-gases).
Requires a cage superstructure to mount: retrieval cables, water circulation screws (for even heating). Special compression fans to force water into internal void areas (only enough that the internal pressure is marginally greater than the external during curing).
This could only be economical for mega size manufacturing in which the requirements for this technique are less expensive than a standard mega size heat chamber and pressuring. In standard technique Pressure is achieved using vacuum and or mechanical press. A standard mega size curing room has mega size costs. This could be a way to reduce cost on big projects.
Edit: https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.nationalgeographic.com/adventure/article/hydrothermal-vents-discovered-azores-science-environment&ved=2ahUKEwjXlv3vx6CCAxUyv4kEHZnsBH0QFnoECA4QAQ&usg=AOvVaw1Jm6aJYMLuODMdopGTz8Iw
Edit2: duh it's not just hot high pressure water, it is also super acidity. 🤦
Wouldn't be economic because making everything acid resistant would be too costly. There is also disturbing or altering the natural environment of the fascinating, rare islands of life that thrive there. I have wondered about how the species travel to colonize other new deep sea vents. Do the eggs of these animals travel randomly on currents and or lay dormant all across the deep ocean, or do adults travel to new vents guided by the smell?
@codyhughes4472 Says:
These animations are pretty much pointless haha
@spockbetter Says:
why didn't they just dodge when the hull compressed? are they stupid?
@PanicOregon Says:
the visualization at 9:36 wasn't that hard to spot, it's pretty easy to spot when you're checking the edges instead of looking at the entire object.
@resiakanam8502 Says:
Great video actually
@d7home2129 Says:
In your falling tube demonstration, you made a false assumption. You assumed that all the ater in the column is going to have kinetic energy after losing the potential energy( by "falling"). This is wrong, almost all the potential energy lost from the column is going to be transferred as kinetic energy to the escaping water. Which will have a tremendous speed not just freefall. It seems like you have never seen a faucet. Do you think the water in a faucet is merely free falling? ( Admittedly, the celocity of the escaping water is the same as if the water droplets have free fallen the whole distance from ocean surface to the submarine depth not the velocity of free falling the couple of meters inside)
Please refer to Bernoulli principle from high school physics.
P1(surface pressure)= P2(air within submarine)=1 atm
v1=0, v2=?
h1=0
h2=-5000m (I am not sure)
Apply values to equation
v2=sqrt(2gh) =sqrt(100000)=316m/s not slow
@serhiysubota421 Says:
Size matters. The 3km water column is ~0.5% compressed (15m) by its own weight.
Imagine that spring let go into the hull.
The pressure force does not have to accelerate the entire water column in an instant. Hence analogy with different sized falling solid objects is leading to wrong conclusions.
@andrewatwood4711 Says:
Very informative now it makes sense thank you😊
@adairjanney7109 Says:
Water isnt incompressible, see footage of nuclear bomb test that create blackbody by compressing the water
@dominikmuller4477 Says:
whales do this by not having any air with them when they dive. They exhale before diving, then just let their lungs collapse, and store all the oxygen they need in their muscles and blood
@SandyRiverBlue Says:
Could have been handled with a brief explanation of what decompression is.
@TopazBadger6550 Says:
Excellent work!
@green-lean-espeon Says:
So, basically: Water bullet.
@berrodude Says:
I loved this video, but I'm not sure there are many people that don't realise these people died by being smacked with a butt load of mass at speed
@LukeDeveraux Says:
We don't deserve Thunderfoot.
But we got him anyways.
Thanks brother.
Love your content. 👍💪🔥
@thomasetavard2031 Says:
Your description of whales and their lungs getting compressed is not exactly correct, in order for this to be the case the flesh and bones of the whales would get compressed as well. This is not the case, they actually behave more like the sub with thick walls you describe. Sure, some compression occurs but not nearly as much as you say. Humans are not nearly as big as whales therefore we do not have bones as big and big volumes of flesh to help us go deep but whales do.
@TaserFish-qn2xy Says:
Cool video and visualisations. It made me understand this better than any other video.
But I think there is a minor mistake.
The part of incompressible water filling the gap at freefall speeds regardless of depth seems fishy to me. Let me explain why.
The gap would fill at freefall speeds if the water only fell from the top of the bubble.
But why would it ?
The water can flow in from any which side. I think this, the geometry of the problem makes a big difference. It's 3d, not 1d.
While I have not done any simulation or calculations, intuitively I would expect a roughly radial inflow.
But I think the big difference would still be that instead of a shockwave of decompression that shoots water into the bubble at crazy speeds from the get go, the incompressible scenario would start the bubble "front" static and have it slowly accelerate inwards until it's fully collapsed.
But if I had to guess, even the incompressible case is much faster than free fall.
@anoriolkoyt Says:
I find these "semantical" discussions (such as voltage or current killing you) are limited because in the end, its still the transformation of energy that kills you. Here, its potential energy (pressure) converted to kinetic energy (water movement). Part of the kinetic energy breaks the bonding energies of the molecules in your body while another part is being converted to heat. An conservation of energyy analysis would yield more insight, I think.
@leoarc1061 Says:
Sure, if, theoretically, you fill the lungs with a liquid of the same density as the water, and which is capable of transferring oxygen into the bloodstream, the lung issue will be solved (even if it crushes the spine in the process).
But what about the other orifices? What about the pressure delta between the water and the cranial cavity? What about the stomach, the intestines, reproductive organs, the ears, the eyes?
Water would rush in from everywhere.
I know that you are trying to put the point across that pressure differentials are what matter, that pressure is relative. But using a human being in this thought experiment was not ideal.
@DavidGS66 Says:
At 16:12, I don't believe there's a fine line with water at 370 atm on 1 side & 1 atm on other side in a wide area around the sub. Maybe inside the sub at point of rupture & a pressure gradient would form everywhere else until implosion is over & P becomes uniform again. How, by combination of decompression & enough water to fill sub at 370 atm falling & recompressing all the way from the surface. I think Bernoulli equation has issue of compressibility built into it by (ro×g×h)1 - (ro×g×h)2 because ro 2 is at 370m. Extremely complicated, so computer simulations will probably just assume constant P of 370 atm outside sub. Pressure = F/A, so water will fall faster because of Fg + (P×A=Fp)
@Kibernautas Says:
Thunderfoot, plastic is not the same as plaster.
Care to apologise?
@c0r3s4v3 Says:
the most expensive and instantanious [Will it Blend?] experiment 💥🩸
@genzen6129 Says:
So the wieght of the water compresses the water below causing an immense pressure on the sub that gives way, exposing 1 atmosphere to 400. Isnt that what everyone was already saying just in a less scientific way lol?
@whatifschrodingersboxwasacofin Says:
What’s in between the red ones and the blue ones?
@powerlocalmedia5130 Says:
🎼They all died in a plastic submarine, a plastic submarine, a plastic submarine 🎼
@penroc3 Says:
they use liquid breathing in the NICU baby icu
@GeorgeJoubert-id2cv Says:
I work with cavitation as ultrasonic probes and you are hilariously wrong about water moving at free-fall speed, when a cavitation bubble collapses its over 200 atmospheres of pressure moving several times faster than a 50 calibre bullet and the water heats up to around 5000 kelvin from nearly absolute zero (microenvironment) - this is at standard pressure and temperature, a bubble collapses at around 2000 meters per second, not 9.81 meters per second per second - you are so hilariously wrong for someone that claims to be a physicist/engineer/maths science youtuber guy - stick to skimming patreon bucks from stans and leave the engineering to the engineers that actually work in the field my guy
@Blobby192 Says:
if it worked and no problems people would have said nothing, youtubers got to make content for money i guess
@TMCNJ Says:
So it wouldn’t have even mattered if a sub was pressurized to 10 Atmospheres? This is interesting to learn thanks 👍🏼
Hm... New death sentence method? :D Pressure hull that can handle being filled by insane speed water, then just drained normally :P Guaranteed humane cos the inmate being executed is dead before the brain even registers the pain, let alone the visual stimuli of the execution method, and that's not even considering processing time.
@maximilianlindner Says:
99% of people who I talk to seem to believe, that water is truly incompressible. 🤷🏼♂️
@AndTecks Says:
Still have not fixed your incorrect assessment? I know this is how you make a living but this is a bit much
@rebeccachambers4701 Says:
I think people because they live in 1 atmosphere pressure they really misunderstand how heavy it really is I mean the stuff is so thick that we live in that it literally tears up comets and meteors before most of them can even reach the surface
@Linvoilac Says:
by the way, even proteins have small vacuum cavities. when you put them and their solvant (water) under strong pressure (1000+ atm), the water around the proteins reaches for the cavities and unfolds the proteins on their path. similar unpleasant phenomenons can occur to your cells and basically most of your components. That's quite damaging and requires quite some genetic adaptation. Thus the water-filled diving suit is also for moderate pressures only...
@DeepFriedDave Says:
worta 🤣
@shamanahaboolist Says:
Some good modelling there.
@Superknullisch Says:
Very interesting.. But it still sounds a bit strange to my ear, as if you for example, submerge a plastic water bottle, just below the surface with a 1 x 1 mm hole in it on one of the sides, let's say. And another hole of the same diameter on the top, at a 90 degree angle from the first one (i.e. a quarter of the circumference away from the first hole, seen from the bottom or top of the bottle), so that air can escape. The water beam, will have a very bent arc. Barely able to not collapse and instead follow the inside of the water bottle, to the lowest point of it. But if you now push down that bottle, say, to one meter. the water beam will be much faster and more straight, right? Or am I remembering this experiment wrong?🤔 And if this is the case, then the water wouldn't just enter the sub "at free fall speed, more or less" as you described it, if water was incompressible. Or is the difference in this example that, the water ins't actually traveling at free fall speed at surface level nor at one meter of depth. And thus, until you reach a depth sufficient enough to get you to free fall speeds of that water beam, pressure makes a difference to the water beam speed?
@iforce2d Says:
hoo boy, that's gonna make your ears pop for sure!
@elbu2968 Says:
With your theory, a blast will not kill people either. I think your arguing is wrong. You forget an important aspect: time. You most likely are aware of cavitation. This will seriously damage material, even the hardest. And don't forget the heat produced at the same time.
The "Speed of Sound" you use is also incorrect. The defenition of the speed of sound in air is the propagation speed of an infinite small disturbance. In simple words'loud noise moves faster than soft noise. An example is the sonic boom produced by a plane flying faster than the speed of sound. This Boom (shockwave) moves at the same speed as the supersonic plane and can cause a lot of damage.
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