This is a test for the passenger oxigen supply System for any airliner. This test is not stupid but necessary to improve flight safety! I have done high pressure chamber and rapid decompression Training during my flight Training and nobody died there. You can have symptoms of decompression sickness but they arent that severe and can be cured easily. It is more dangerous as a diver! Why he becomes unconcious is that the ambient pressure and partial oxigen pressure decrease... This test was about the TUC time of useful conciousness... in 45000ft (FL 450) you have between 5 and 15 seconds until you black out because of pressure loss and no oxigen supply. in 25000ft it is between 3 and 5 minutes... Why fog appears is because of the decompression. Even in my Training with a rapid decompression to approx 30000ft it was really cold fog caused by expansion. This is absolutely not a Problem because it is all under medical observation
Hi The video is from the Civil Aerospace Medical Institute. Its a FAA research facility. The video was shot in the 60s here at CAMI. It was a research study on TUC during decompression. I have been an employee there for over 30 years. Many wonderful studies that have saved countless lives has occured there. I worked in that exact altitude chamber.
Hi George, many thanks for your information. I got this video in the mid 80s from FSI in Wichita in NTSC format. As it is one of the most impressive videos, I converted it and uploaded it for the aviation community. Happy to know now from where it came from. Guess you had a great time at CAMI! Cheers from Austria. Gerhard
thats actually terrifying, he had roughly 5 seconds of conciousness then lights out. Had he been a pilot he'd have crashed without help. Most planes dont decompress that quickly even with decent sized holes so its not quite that fast but still. You have very little time to get that mask on, ALWAYS put yours on first then help others.
@@jgfakjshfdgkajshd Im pretty sure most people know what a fire does to you immediately. With something like oxygen deprivation, you would even know what was happening to you. Its not like something you can see, like you can with fire.
True fckn story.. I never thought it was so fast..and imagine that instant fog appearing as well..even if it's a second.. that's some overall scary sht
Start showing that video and it might just relieve the congestion at airports as people start deciding maybe a bus, train, boat or plain old fashioned drive might be preferable…..🤣. Would be interesting if they showed it to passengers just before sealing up the aircraft for departure and see how many go running for the door, deciding maybe they really don’t need to get where they wanted to go that badly after all… 🍻😎
Bless his heart... My Grandad who is now almost 92 years old told me he underwent similar testing when he was in the Air Force in the 50's. He said that some guys would panic before the decompression drill began and they'd have to take them out of the chamber and start again. He said you could cut the tension with a knife. Even though it's a simulation I think I'd be pretty scared also.
Some folks might not understand why the man loses consciousness in just seconds, when any healthy person can hold their breath for a minute or even several minutes, and one can even completely blow all the air out of their lungs and still go for a minute or more without breathing and still remain conscious. The reason the man passes out so quickly is because at such a high altitude, the partial pressure of the Oxygen in the atmosphere is reduced to such a low partial pressure that the Oxygen molecules in a person's lungs' capillaries can't pass into the blood and attach to the red blood cells. This is why oxygen supplied via nasal cannula only works at altitudes up to 18,000 feet. Beyond that the oxygen needs to be delivered via a tight fitting mask so it can be pressurized.
The whole basis of this test was to show the difference between the response time of crew in executing mask donning during actual simulated decompression. The result was that trained aircrew got their mask on in a mean average time of 9 seconds. The untrained took a mean average time of 23 seconds. Training makes a difference. And this was done in association for getting SST certified.
What gets you is not the total lack of air pressure, but the drop in the partial pressure of oxygen. There was no blood boiling, (probably) no decompression sickness (the bends), and (probably) no death. To give you a comparison, the pressure differential between sea level and FL450 is LESS than the pressure differential between 10 meters/33 feet under the water and the surface.
And since sea-level pressure supports a 33-ft column of water, your statement holds true for any altitude, including space. Is decompression to orbital pressure (with breathing mixture) as safe as ascending from a 33-ft dive?
Ted Crum Yes, absolutely. Ascending into a vacuum is totally as "safe" as ascending to sea level on Earth. Not. Point is, exposure to a vacuum or near vacuum does not cause your blood to "boil." You don't die from DCI. You die after a few minutes form hypoxia. Are you one of those people that thinks the things Jon Stewart says count as "news?" ;)
Andy Robinson i wonder if you can really compare the pressure differential value and link it to the effect of going into a vacuum. The boiling point of water remains the same for a diver. But when going into a vacuum the boiling point of water will go down as will the solubility of gases in blood. diver and decompression cases are therefore incomparable.
Wearing masks above FL410 is probably the most violated rule in aviation. Impressive video, Thanks for posting! If I remember correctly, only the Concorde (flying at 60,000ft) was exempted from this rule. Happy Landings, Guido
i did a decompression run with a practise explosive loss of pressure at about the same height....it's hard not to panic trying to get that oxy mask on your face before you lose it
@@gazzathomas1423 - Yes...There are three, no, five, no, six (as I'm writing this) things i learned from this explosive decompression video. 1) The fog might obscure vision to even be able to *see* the ox mask if or when it drops in an explosive decompression. 2) The wind blowing the mask and tube may make it impossible to capture the mask as it sways. 3) The plane may also be swaying, making it further impossible to catch. Have you ever tried to change a radio station (old car radio) while your car was bouncing around?. 4) Looking at this guy fail to put the mask on even while *expecting* the decompression, makes me think I could be unconscious before realizing i even *need* to grab the mask. 5) Judging from the speed he went unconscious, looks like the wind got sucked out of him, and likely same would happen to us.....6) not only do we need to find/catch the ox mask if it drops, we would also have to remember in the chaos to *yank* on the tube to activate the ox, and with my luck I would end up yanking the tube off the ceiling😛
@@belliduradespicio8009 Concorde cruised between 50,000 and 60,000ft, so that’s even higher than 41,000ft. She would go up or down between those heights depending on fuel and atmospheric conditions. Of course, no other aircraft would be around up there so she had that block altitude to herself. Her passenger windows were small incase of a rapid decompression, although travelling at Mach 2 at 60,000ft, there’s not much time to act even with all the precautions.
@@cmans79tr7 It is not a matter of the wind getting sucked out of his lungs, it is a matter of the partial pressure of the Oxygen in the atmosphere being reduced so quickly to such a low partial pressure, that the Oxygen in a person's lungs' capillaries can't pass into the blood and attached to the red blood cells. That is why a person loses consciousness so rapidly. (Empty your lungs completely right now, and you won't lose consciousness for at least a minute if not more). This is why oxygen supplied via nasal cannula only works at altitudes up to 18,000 feet. Beyond that the oxygen needs to be delivered via a tight fitting mask so it can be pressurized.
One thing a guy can do to experience this (safely) is go to Oshkosh air venture, visit the FAA safety hangar and climb in the oxygen deprivation chamber. It's the best 5 minutes of my life I'll never remember.
We went to 41,000 feet during my session in the chamber. We pre-breathed 100% oxygen for 30 minutes before going "up". If I recall correctly we pre-breathed 100% oxygen to displace nitrogen in our bloodstream so that we wouldn't get the bends. Not exactly the bends, but an intense ear ache. I got a bad ear ache but they said it would be intense without the pre-breathing of oxygen. Your body "outgases" from every pore in your body. (yes, down there too) You actually inflate as gasses form and outgas from your body. Each participant gets to experience their personal symptoms of oxygen deprivation and they learn how and when to recognize their need for supplemental oxygen.
I'm five years late to the party, but I just wanted to say that I'm fairly damn certain that qualified business jet pilots have received extensive training on the matter, lol 🍻
Perhaps Gypsy I doubt it's standard for even airforce pilots to go through that kind of training. My point is that they will be well versed in the dangers of explosive decompression, and part of that training will involve watching videos like this one. You don't give a guy a pilot's licence and a multi-million dollar jet on the hopes that he already somehow understands the dangers, lol 🤝 🍻
Well, another one of those videos of low quality but with great content that the CZcams algorithm recommends us every generation. I think that's it my friend. I hope we can see each other again at another comment session ten years from now.
I find it hard to believe this tested was conducted at an equivalent 45,000 feet. That sounds dangerous to me. However I went to the altitude chamber as all flight crews do and we did rapid decompression at something lower than the 40s. Rapid decompression is not as dangerous as a slow leak. We experienced that too. I saw a guy take his mask off when instructed to do so, at ....I forget.....41,000 feet. (Fellas, does that sound right. He did a few exercises to test his alertness.....like adding numbers...stacking blocks....how many fingers do I have up, and so forth. At one point the instructor looked at us as if to say, "He's had enough." So he says to the subject, "Ok now, go ahead and put your mask on." ....."My mask is on." (Instructor looks at us again) "No it isn't. Reach for your mask and put it on." ...."My mask IS on." Subject is now a little belligerent. Instructor puts his mask on for him. .....subject resisting him doing so.) I think that every pilot and flight attendant and any other flight crew members should experience the altitude chamber.
I’m a Captain at a major US airline. Once the masks deployed on my flight. Half the people didn’t even bother putting them on. The other half that did put them on, didn’t pull down to activate the oxygen chemical generator.
@@jayemeljay2117 hun I dont live in the states sadly;I live in some latam sh1thole where opiods are strictly banned(not even cancer patients get them)and you can only get drugs if you are banging some thug,they considered me a goody two shoes and a dork,but deep down Im a twisted b1tch even more so than their slvts Be Thankful to god you live in USA
This test is 'real life'. Looks very scary, best to avoid rapid decompression. But if it happens nice to know the Oxygen system functions. In movies they miss the part of fog forming when pressure suddenly drops. This test is the real deal.
The video appears to be running about twice normal speed, you can just barely make out the second hand of the clock going around behind his head, and about 40 seconds goes by during the whole video. Either way, 10 seconds or 5 seconds is extremely fast.
I'm just curious, so here's an interesting question (with probably an obvious answer): If you can hold your breath and not pass out for a couple of minutes (i.e. you are not inhaling additional oxygen for this period of time), how do you black out so quickly through rapid decompression? Thoughts?
When decompression occurs, pressure differential between the cabin (now at 45.000ft) and your lungs (still at 6000-8000ft) makes it impossible to hold your breath. Air is looking for a way out and quickly exits your lungs, whether you want it or not.
In addition, the oxygen in the blood in your lungs is at a partial pressure below that required for subsistence. You're literally only conscious for the time it takes the blood to circulate from the heart to the brain then it's lights out.
RS RT is right, it's all about the partial pressure of oxygen in the blood, the amount of air in the lungs is insignificant as a factor. Your ability to hold your breath is meaningless when the partial pressure of oxygen in the air and in your blood drops near zero. For example, in anesthesia we have patients breathe 100% oxygen before going to sleep. This maximizes the partial pressure of oxygen in the lungs and blood. In this state, you could not breathe for up to ten minutes without your oxygen levels dropping.
Fl450 is pretty high though, think FL410 is the max, thought how much better the aircraft performs just 3000 feet lower is a good question.. Doesn't sound like much, but one has the a commercial aircraft at it's absolute limits, close to coffin corner with no extra performance margin at that height ( maybe a gulf, or private bird could handle it).. It's not only a question of getting your mask on, it's getting the bird stable and under control before a fatal spin and the effectiveness of control surfaces, getting out of controlled flight in super thin air can exceed the birds structural limits, or surpass the control surface limits pretty quick.. no to mention flameouts, and lack of thrust, and trim issues
Wonder why there are not oxygen masks inside lavatories of passenger aircraft? No chance to grab one, when one is "stuck" inside during an explosive decompression.
I can remember suffering from explosive decompression in one of those lavatories. But it wasn't the air that was explosive. I had eaten something at LAX and the effects were devastating. Anyone using the place after me would have needed one of those oxygen masks.
If you did it would literally cause the alvioli in your lungs to burst, permanently destroying your lungs. In any case, the human lungs/trachea/epiglot where not designed to hold in air against any significant drop in pressure, and the air is literally ripped out of your lungs, reducing the partial pressure of oxygen in the blood to below subsistence level. You will only remain conscious in the time it takes for the blood to travel from your heart to your brain. So please, secure your mask FIRST before assisting others.
In addition to the comments above I'd like to add even if you were able to hold your breath you still pass out since the reason you pass out is because the drop in pressure lowers the amount of oxygen in your blood reaching your brain.
It won't affect your inner-ear at all. But your middle-ear will be. Your ears will "pop" just like on a normal ascent...just happens more frequently during a decompression. I have been through probably a 1000 decompression in my 40 year career with no ear issues at all. Now coming down from altitude is a whole other issue.
@@oldtimehockey7324 its not something you'd want to do if you had a head cold though. with blocked eustachian tubes, i imagine it would be pretty unpleasant.
Sabine Gruber I don't think so. Just look at how things move. Objects don't appear to have realistic inertia. It's not sped up a whole lot, but I believe it's sped up.
+Mike Kobb this may be an old comment but I just wanted to say it looks sped up but it is actually just the lack of air in the room. No air no resistance.
So, dont read this if you're someone who likes thinking the safety rules in the chair are important. -Most crashes either result in all passengers surviving or only a few surviving (usually based on angle of impact, speed and seat location). -Passing out at high altitude is fine and even expected by the airline, they know there's a good chance you won't get your mask on, the plane flies low enough it can reach breathable atmosphere before you die. -The majority of accidents happen in the first and last five minutes. -birds and sleep deprivation are the real killers. -your pilot is a connoisseur of energy drinks and coffee. -so is the person telling your pilot what to do. (Atc)
Concorde had much smaller passenger windows than a conventional airliner. They’re tiny by comparison. The idea was that if a window blew out, the smaller area would slow the rate of decompression. Fortunately it never happened.
Right! In an air-/spacecraft the change of pressure may be up to „only“ 1 atmosphere. The poor guys at Byford Dolphin had a pressure change of 9 atmosphere.
@@Sunflyer54 Damn, how can one even survive that? Even in a controlled environment with medical experts on standby, I imagine the risk of death is significant.
@Luka well, funny you say that actually, because the guys at the byford dolphin...Didn’t...survive...like, at all...apparently it was one of the most gruesome accidents in human history.
dude that is WILD. you literally dont even have time to put the mask on... he actually didnt even make it to putting the strap around his head. that guy is dead if hes a pilot.
I wouldn't say that this is the OPPOSITE per se. The bends is a form of Decompression Sickness caused by nitrogen bubbles lodging in places where they ordinarily wouldn't be (joints, spinal cord, blood and then places where blood deposits gases), whereas what you witnessed here is lack of adequate oxygen... kind of. (there's more to it than that)
@@melissachartres3219 Thank you for your reply. Even as a child I would wonder about things like that. My father was a wealth of knowledge because he read a lot and he would talk to me about things he read even when I was a preschooler. I think he would have loved the internet. Also I plan to learn more about this in the future.
@@annehoskins5795 Smiley face emoticon! YaY! Thanks for having gotten back to me... and YES... please continue to educate yourself throughout your lifespan... it will almost assuredly increase your absolute wealth.
Nope. It's not that much of a pressure difference. Almost none in fact. Even if it was a vacuum. It would be like diving 10 metres beneath the sea and then resurfacing
@@AverageAlien that can't be right, sometimes when going up a mountain in a car, if you go up too fast you can feel your eardrums pop, if a window of a plane breaks won't a lot of stuff get sucked out? Isn't that why even if the pressure of the plane is not sea level, you bags of potato chips and your feet inflate?
@@dutelatte2154 Yes, but that's absolutely nothing and will hardly affect you outside of your ears popping. If there is a small exit point for the air to get out, like a window, there will be a lot more suction, because all that air has such a small place to get out from.
If the pressure change was extremely fast like when a bomb explodes, or you instantly teleport to the outside of the plane, then yes, your lungs will explode, wikipedia says that with 0.69 atm of pressure change that happens, However if the pressure is released slowly, like in this video, then the air will come out of your lungs slowly and there will be no physical damage. at 45000ft that would be about 0.75 atm
@@Myemnhk What's surprising is how quickly he lost the oxygen already in his body and passed out. It can't all be due to lack of pressure, as fighter pilots often fly at or above 45,000ft with just an oxygen mask.
@@Pete856 well fighter jet cabins are pressurized, not the same amount as passenger planes but they are pressurized. Since they aren't pressurized as high as passenger jets they still need supplemental oxygen at certain high altitudes, but it is nowhere near fl450. Since the concentrate of a gas in a liquid is directly related to the pressure since the pressure dropped the concentration of oxygen in the blood dropped too, it was only so fast because the pressure was so low. If it was like 25000 feet and not 45000 you'd be conscious for 3-5 minutes before you pass out from oxygen deprivation. Look up henrys law if you want more information I don't know much about it to give a better explanation.
Considering that most civilian airliners won't fly above FL420 (around 42,000 feet pressure altitude) I'm guessing that this demonstration could be considered extreme for most civilians undergoing a course or training at CAMI.
That's a quick way to get a burst lung! Trying to keep 1 bar in your chest whilst a pretty good vacuum is pulled around you wouldn't do your lungs much good. It's why you have to keep breathing whilst ascending from depth whilst diving. The only exception is free diving because you start with one lungful only.
Haha... Dont put me wrong... The guy approaching him for checking and emmidiately putting his mask on, felt like a sneaky robber 😂... And there should be multiple buttons to eject oxygen masks in an airplane, like one at cockpit, one at management and hostess staff so that it can be quicker.
@@auroralshine6176 Masks deploy automatically when there’s a decompression, but some airliners do have controls on the flight deck and cabin crew positions incase they fail to deploy.
@@muttley8818 let’s be real If they did fail to deploy it would be too late to push the button for the passengers You would just have to descend and hope it’s not too late
I've seen the question already asked, but the answer given didn't explain much. Why would you pass out so quickly at altitude? The average adult can hold their breath for much longer than 5 seconds. I fail to understand why depressurization would have such an effect.
You wouldnt be able to hold your breath because it would expand and leave your body with as much pressure as 1 atmosphere. Gasses have more kinetic energy than liquids. Gasses which are dissolved in liquids (like oxygen in blood) stay in the liquid because there is enough gas pressure from outside the liquid to keep it in there. Once the pressure outside the liquid is gone, the dissolved gasses bust out because of their relative higher energy. Also, your blood oxygen levels need to be higher than something like 85% for your brain to work right and we sit at 95%-100% normally. You dont breathe to force air into your blood, you breathe to exchange new and old gasses. The pressure of atmosphere is what forces the air into your blood and prevents it from escaping too easily.
The one thing I take away from this, if someone who’s prepared for what’s happening has this much of a problem, can imagine the shitshow on a real passenger aircraft.
During the safety briefing on passenger aircraft they really gloss over the importance of putting your mask on before anyone else’s. Like, they should stress, “You risk your own life by trying to help others before putting your mask on. You MUST put your mask on before helping others in the event of a decompression.”
The recent space flight elevator rides, by Virgin Galactic and Blue Origin, may come to an abrupt end should their craft suffer a sudden depressurization. The passengers do not wear pressure suits so they will be subjected to the virtual vacuum above FL450. Their apogee goal is to travel beyond the Kármán Line, or 100KM above the Earth.
it happened before, soyuz 11. at 160KM a valve broke during separation, and the cosmonaut trio were killed in just over 100 seconds. the first people to inhabit a space station. after that, no more shirt-sleeve re-entry for soyuz crews.
Holding your breath in a near vacuum would likely cause you so much pain in the chest you would violently exhale. Then you're stunned and unable to even gasp for air.
Major respect to the people who put themselves in danger to create the safety standards we use.
you mean white alpha males! not "people"!
@@bent540 Poor bait
@@reclusiarchgrimaldus1269 truth and factual statistics are neither bait nor trolling.
@@bent540 dammm u ain't lying
@@bent540 we get it, youre pickle rick
I've seen the longer version , about 2 seconds after the guy get his mask on, he wakes up and swears he was conscious the whole time
Where
@@expectnothing9032 I don’t think they have the password to their account anymore lmaooo
Sooo its like having sleep paralisis?? :C thats scaryyy
@@expectnothing9032 here the last test subject czcams.com/video/m8ooGY8Jbqw/video.html&ab_channel=ATFSCrash
Oh the irony is killing me
This is a test for the passenger oxigen supply System for any airliner. This test is not stupid but necessary to improve flight safety! I have done high pressure chamber and rapid decompression Training during my flight Training and nobody died there. You can have symptoms of decompression sickness but they arent that severe and can be cured easily. It is more dangerous as a diver! Why he becomes unconcious is that the ambient pressure and partial oxigen pressure decrease... This test was about the TUC time of useful conciousness... in 45000ft (FL 450) you have between 5 and 15 seconds until you black out because of pressure loss and no oxigen supply. in 25000ft it is between 3 and 5 minutes... Why fog appears is because of the decompression. Even in my Training with a rapid decompression to approx 30000ft it was really cold fog caused by expansion. This is absolutely not a Problem because it is all under medical observation
Thanks boss!
What about your ears? Do they hurt from the sudden change of pressure?
@@colebrown8293 how about you give us reason not to first
My cat has eaten a mouse
3-5 minutes at 25,000ft? tell that to Messner, you can survive a lot longer as long as your not fat or unhealthy.
Hi
The video is from the Civil Aerospace Medical Institute. Its a FAA research facility. The video was shot in the 60s here at CAMI. It was a research study on TUC during decompression. I have been an employee there for over 30 years. Many wonderful studies that have saved countless lives has occured there. I worked in that exact altitude chamber.
Hi George, many thanks for your information. I got this video in the mid 80s from FSI in Wichita in NTSC format. As it is one of the most impressive videos, I converted it and uploaded it for the aviation community. Happy to know now from where it came from. Guess you had a great time at CAMI! Cheers from Austria. Gerhard
Cool!
This should be pinned as the video is being recommended to a lot of people right now.
This guy didn't work at this chamber otherwise his grammer would be spot on.
@@pimpsqueak7891 Dude, he doesn't work in a library
thats actually terrifying, he had roughly 5 seconds of conciousness then lights out. Had he been a pilot he'd have crashed without help. Most planes dont decompress that quickly even with decent sized holes so its not quite that fast but still. You have very little time to get that mask on, ALWAYS put yours on first then help others.
Its even worse for deep sea divers. That is some scary shit because you have a great chance of drowning.
@@johnnyc5853 you think your breathing in water under that pressure?
@@shroomiestshroom3655 yes, in a submarine
Agreed, he woulda been f-d in the a...
@@internetguy692 he said deep sea divers not a submarine so it still wouldnt matter
They should show this to passengers on flights, so we know why we need to get them on first before helping others.
And then scenes from a real fire ? It would be too scaring I think
@@jgfakjshfdgkajshd Im pretty sure most people know what a fire does to you immediately. With something like oxygen deprivation, you would even know what was happening to you. Its not like something you can see, like you can with fire.
True fckn story.. I never thought it was so fast..and imagine that instant fog appearing as well..even if it's a second.. that's some overall scary sht
no. a short animation of a square figure would be better. this makes passengers uneasy and disrupts the calm mood airliners want passengers to be in.
Start showing that video and it might just relieve the congestion at airports as people start deciding maybe a bus, train, boat or plain old fashioned drive might be preferable…..🤣. Would be interesting if they showed it to passengers just before sealing up the aircraft for departure and see how many go running for the door, deciding maybe they really don’t need to get where they wanted to go that badly after all… 🍻😎
This is why they say to put your mask on first before assisting other passengers.
Exactly..
From now on I'll do whatever the pilot says.
@@Adrian-jk4kx maybe the mask should drop first before the decompression applied..
@@AhmadMabruriBBeruri why would it drop then ?
@@Vranabg I mean it should drop just before anything bad things happen. Not like in the video. It drops after decompression initiated.
@@AhmadMabruriBBeruri this is to simulate real world situation, where masks drop after decompression occurs.
Bless his heart... My Grandad who is now almost 92 years old told me he underwent similar testing when he was in the Air Force in the 50's. He said that some guys would panic before the decompression drill began and they'd have to take them out of the chamber and start again. He said you could cut the tension with a knife. Even though it's a simulation I think I'd be pretty scared also.
Even a simulation is pretty stressful.
Thank you for sharing this info 👍
Some folks might not understand why the man loses consciousness in just seconds, when any healthy person can hold their breath for a minute or even several minutes, and one can even completely blow all the air out of their lungs and still go for a minute or more without breathing and still remain conscious. The reason the man passes out so quickly is because at such a high altitude, the partial pressure of the Oxygen in the atmosphere is reduced to such a low partial pressure that the Oxygen molecules in a person's lungs' capillaries can't pass into the blood and attach to the red blood cells. This is why oxygen supplied via nasal cannula only works at altitudes up to 18,000 feet. Beyond that the oxygen needs to be delivered via a tight fitting mask so it can be pressurized.
Many thanks John for this excellent explanation! 🙏👍
Thank you
You are a nurse John ?
@@rand0mGT i'm sure a quick google search will get you just the answer without having to be a nurse to know that information
and there’s people who climb mt everest without oxygen.
The fog is caused by the drop in pressure and temperature. Because cold air can't hold as much water vapour, much of it condenses out as fog.
The more you know.
It's just from the drop in pressure which is why you can boil water at room temperature in a partial vacuum...
HVACR technician, or engineer?
Isn't this literally the same reason that pressurized aerosols fog up on release?
The whole basis of this test was to show the difference between the response time of crew in executing mask donning during actual simulated decompression. The result was that trained aircrew got their mask on in a mean average time of 9 seconds. The untrained took a mean average time of 23 seconds. Training makes a difference. And this was done in association for getting SST certified.
Many thanks George. As an insider, your contributions are more than welcome!
It's insane scary how fast hypoxia sets in.
What gets you is not the total lack of air pressure, but the drop in the partial pressure of oxygen. There was no blood boiling, (probably) no decompression sickness (the bends), and (probably) no death. To give you a comparison, the pressure differential between sea level and FL450 is LESS than the pressure differential between 10 meters/33 feet under the water and the surface.
And since sea-level pressure supports a 33-ft column of water, your statement holds true for any altitude, including space. Is decompression to orbital pressure (with breathing mixture) as safe as ascending from a 33-ft dive?
Ted Crum Yes, absolutely. Ascending into a vacuum is totally as "safe" as ascending to sea level on Earth. Not. Point is, exposure to a vacuum or near vacuum does not cause your blood to "boil." You don't die from DCI. You die after a few minutes form hypoxia.
Are you one of those people that thinks the things Jon Stewart says count as "news?" ;)
Andy Robinson i wonder if you can really compare the pressure differential value and link it to the effect of going into a vacuum. The boiling point of water remains the same for a diver. But when going into a vacuum the boiling point of water will go down as will the solubility of gases in blood. diver and decompression cases are therefore incomparable.
@@micaheiber1419 no you can't
@@drivediveflyatr Any exposed fluids will for sure boil away if you were fully exposed to near-vacuum.
Wearing masks above FL410 is probably the most violated rule in aviation. Impressive video, Thanks for posting!
If I remember correctly, only the Concorde (flying at 60,000ft) was exempted from this rule.
Happy Landings,
Guido
i did a decompression run with a practise explosive loss of pressure at about the same height....it's hard not to panic trying to get that oxy mask on your face before you lose it
@@gazzathomas1423 - Yes...There are three, no, five, no, six (as I'm writing this) things i learned from this explosive decompression video. 1) The fog might obscure vision to even be able to *see* the ox mask if or when it drops in an explosive decompression. 2) The wind blowing the mask and tube may make it impossible to capture the mask as it sways. 3) The plane may also be swaying, making it further impossible to catch. Have you ever tried to change a radio station (old car radio) while your car was bouncing around?. 4) Looking at this guy fail to put the mask on even while *expecting* the decompression, makes me think I could be unconscious before realizing i even *need* to grab the mask. 5) Judging from the speed he went unconscious, looks like the wind got sucked out of him, and likely same would happen to us.....6) not only do we need to find/catch the ox mask if it drops, we would also have to remember in the chaos to *yank* on the tube to activate the ox, and with my luck I would end up yanking the tube off the ceiling😛
@@cmans79tr7 Good to know. If O2 system deploys reach high and follow tubes to mask.
@@belliduradespicio8009 Concorde cruised between 50,000 and 60,000ft, so that’s even higher than 41,000ft. She would go up or down between those heights depending on fuel and atmospheric conditions. Of course, no other aircraft would be around up there so she had that block altitude to herself.
Her passenger windows were small incase of a rapid decompression, although travelling at Mach 2 at 60,000ft, there’s not much time to act even with all the precautions.
@@cmans79tr7 It is not a matter of the wind getting sucked out of his lungs, it is a matter of the partial pressure of the Oxygen in the atmosphere being reduced so quickly to such a low partial pressure, that the Oxygen in a person's lungs' capillaries can't pass into the blood and attached to the red blood cells. That is why a person loses consciousness so rapidly. (Empty your lungs completely right now, and you won't lose consciousness for at least a minute if not more).
This is why oxygen supplied via nasal cannula only works at altitudes up to 18,000 feet. Beyond that the oxygen needs to be delivered via a tight fitting mask so it can be pressurized.
One thing a guy can do to experience this (safely) is go to Oshkosh air venture, visit the FAA safety hangar and climb in the oxygen deprivation chamber. It's the best 5 minutes of my life I'll never remember.
We went to 41,000 feet during my session in the chamber. We pre-breathed 100% oxygen for 30 minutes before going "up". If I recall correctly we pre-breathed 100% oxygen to displace nitrogen in our bloodstream so that we wouldn't get the bends. Not exactly the bends, but an intense ear ache. I got a bad ear ache but they said it would be intense without the pre-breathing of oxygen. Your body "outgases" from every pore in your body. (yes, down there too) You actually inflate as gasses form and outgas from your body. Each participant gets to experience their personal symptoms of oxygen deprivation and they learn how and when to recognize their need for supplemental oxygen.
... every pilot who flies high flying biz jets should watch this one. Damn, is that scary!
I'm five years late to the party, but I just wanted to say that I'm fairly damn certain that qualified business jet pilots have received extensive training on the matter, lol 🍻
@@KumaBean Business pilots are educated and aware. But they don't get this experience. These tests are usually for air force pilots.
Perhaps Gypsy I doubt it's standard for even airforce pilots to go through that kind of training.
My point is that they will be well versed in the dangers of explosive decompression, and part of that training will involve watching videos like this one.
You don't give a guy a pilot's licence and a multi-million dollar jet on the hopes that he already somehow understands the dangers, lol
🤝 🍻
@@KumaBean it still helps to witness it
Travis Ryno
Yep, and that's why students are very likely shown footage as part of their training, 🍻
Well, another one of those videos of low quality but with great content that the CZcams algorithm recommends us every generation.
I think that's it my friend. I hope we can see each other again at another comment session ten years from now.
What a professional assistant. The type you trust your life with. /s
This looks like what my brothers go through when I pass gas in the room.
LOL
That’s foul
🤣🤣🤣Lol!!
Wait-- Oh dear
Damn how bad are your fucking farts, dude? 💀
I find it hard to believe this tested was conducted at an equivalent 45,000 feet. That sounds dangerous to me. However I went to the altitude chamber as all flight crews do and we did rapid decompression at something lower than the 40s. Rapid decompression is not as dangerous as a slow leak. We experienced that too. I saw a guy take his mask off when instructed to do so, at ....I forget.....41,000 feet. (Fellas, does that sound right. He did a few exercises to test his alertness.....like adding numbers...stacking blocks....how many fingers do I have up, and so forth. At one point the instructor looked at us as if to say, "He's had enough." So he says to the subject, "Ok now, go ahead and put your mask on." ....."My mask is on." (Instructor looks at us again) "No it isn't. Reach for your mask and put it on." ...."My mask IS on." Subject is now a little belligerent. Instructor puts his mask on for him. .....subject resisting him doing so.) I think that every pilot and flight attendant and any other flight crew members should experience the altitude chamber.
I wouldn't be able to be the instructor. I'd get too angry at the trainees when they start acting hypoxic, hahaha.
It's been 11 years since this was posted, less than 2000 views to get this to 1 million. Let's do this!
I’m a Captain at a major US airline. Once the masks deployed on my flight. Half the people didn’t even bother putting them on. The other half that did put them on, didn’t pull down to activate the oxygen chemical generator.
"5 seconds and then you pass out"
As a fibromyalgia patient that sounds like heaven to me
Are you using cannabis?
Or look for Wim Hof.. if you follow that man.. most of your pain will go ..
Good luck
@@jayemeljay2117 no man,I dont know anyone in my shit place that sells or wants to sell me
And dont know what that jim is
@@robotzombie4754 I can relate... look him up.. search for Wim Hof method.. I'm sure you'll find someone who knows the method close by
@@jayemeljay2117 hun I dont live in the states sadly;I live in some latam sh1thole where opiods are strictly banned(not even cancer patients get them)and you can only get drugs if you are banging some thug,they considered me a goody two shoes and a dork,but deep down Im a twisted b1tch even more so than their slvts
Be Thankful to god you live in USA
This test is 'real life'. Looks very scary, best to avoid rapid decompression. But if it happens nice to know the Oxygen system functions. In movies they miss the part of fog forming when pressure suddenly drops. This test is the real deal.
Time of useful consciousness ;around 5 seconds
The video appears to be running about twice normal speed, you can just barely make out the second hand of the clock going around behind his head, and about 40 seconds goes by during the whole video.
Either way, 10 seconds or 5 seconds is extremely fast.
I had no idea it was that fast! Good to know that's all the time i have if it ever happens to me.
I was laughing in my head hoping that when the smoke cleared he would just be gone LMFAO
My heart rate must have gone up watching this because my watch told me to breathe when the decompression started lol
Throw it away.
looks like the safety guy was even having a problem putting the oxygen mask on the test person.
I'm just curious, so here's an interesting question (with probably an obvious answer):
If you can hold your breath and not pass out for a couple of minutes (i.e. you are not inhaling additional oxygen for this period of time), how do you black out so quickly through rapid decompression?
Thoughts?
When decompression occurs, pressure differential between the cabin (now at 45.000ft) and your lungs (still at 6000-8000ft) makes it impossible to hold your breath. Air is looking for a way out and quickly exits your lungs, whether you want it or not.
@@arthursinsou6798 Amazing... so. it feels like you forcibly exhale?
@@alejandromechina5959 Never experienced it myself, but must feel like someone heavy jumping on your lungs. Would be too painful to hold the air.
In addition, the oxygen in the blood in your lungs is at a partial pressure below that required for subsistence. You're literally only conscious for the time it takes the blood to circulate from the heart to the brain then it's lights out.
RS RT is right, it's all about the partial pressure of oxygen in the blood, the amount of air in the lungs is insignificant as a factor. Your ability to hold your breath is meaningless when the partial pressure of oxygen in the air and in your blood drops near zero. For example, in anesthesia we have patients breathe 100% oxygen before going to sleep. This maximizes the partial pressure of oxygen in the lungs and blood. In this state, you could not breathe for up to ten minutes without your oxygen levels dropping.
By the looks of it I doubt I’d even get the mask on in time lol
Fl450 is pretty high though, think FL410 is the max, thought how much better the aircraft performs just 3000 feet lower is a good question.. Doesn't sound like much, but one has the a commercial aircraft at it's absolute limits, close to coffin corner with no extra performance margin at that height ( maybe a gulf, or private bird could handle it)..
It's not only a question of getting your mask on, it's getting the bird stable and under control before a fatal spin and the effectiveness of control surfaces, getting out of controlled flight in super thin air can exceed the birds structural limits, or surpass the control surface limits pretty quick.. no to mention flameouts, and lack of thrust, and trim issues
You're fine no plane would ever decompress this fast unless it literally ripped in half
Airlines should show this video before takeoff. NOW I understand why they say put your mask on before helping others. This makes it real.
That’s crazy. He even had it over his mouth, breathing in some oxygen, but still went lights out.
The arm shaking creeps me out, props to these folks.
Wonder why there are not oxygen masks inside lavatories of passenger aircraft? No chance to grab one, when one is "stuck" inside during an explosive decompression.
+Martin R. Pretty sure I remember seeing one in there.
they were removed from all aircraft in 2011 by the FAA, there was a concern that terrorists could use the oxygen to start a fire or explosion
They're still there.
I can remember suffering from explosive decompression in one of those lavatories. But it wasn't the air that was explosive. I had eaten something at LAX and the effects were devastating. Anyone using the place after me would have needed one of those oxygen masks.
@@smitajky An excellent example of the explosive fart decompression.🤣
The arm twitching is eerie
The video only lasts 20 seconds and that pretty much says it all.
Can anyone explain to me why holding your breath isn't effective?
From another comment it seems the rapid pressure change forces the air out of your lungs.
If you did it would literally cause the alvioli in your lungs to burst, permanently destroying your lungs.
In any case, the human lungs/trachea/epiglot where not designed to hold in air against any significant drop in pressure, and the air is literally ripped out of your lungs, reducing the partial pressure of oxygen in the blood to below subsistence level. You will only remain conscious in the time it takes for the blood to travel from your heart to your brain.
So please, secure your mask FIRST before assisting others.
In addition to the comments above I'd like to add even if you were able to hold your breath you still pass out since the reason you pass out is because the drop in pressure lowers the amount of oxygen in your blood reaching your brain.
So glad FL studio is getting a new update
how could anyone get their mask on in time? this guy is actually sitting there ready for it too
Been in that chamber..from STP to FL450 the farts coming out must have been epic.
This is why airline safety videos always tells you PUT YOURS ON FIRST, then help others.
U ghey
In my experience at the movie theater a few years back, the effects were several children laughing hysterically as they exited the restroom.
Question for any flight surgeons or pilots with first hand knowledge. What does this do to the workings of the inner ear?
It won't affect your inner-ear at all. But your middle-ear will be. Your ears will "pop" just like on a normal ascent...just happens more frequently during a decompression. I have been through probably a 1000 decompression in my 40 year career with no ear issues at all. Now coming down from altitude is a whole other issue.
@@georgebrown3097 thank you. It looks so violent I wasn’t sure if your ears could decompress quick enough.
@@oldtimehockey7324 its not something you'd want to do if you had a head cold though. with blocked eustachian tubes, i imagine it would be pretty unpleasant.
I was half expecting this to be a meme, after that white cloud clears out he's gone and replaced by something else...
Skyrim intro?
I see
Still the video was helpful
Thanks a lot for replying ... I kinda doubt I would get one
Suggest they make the masks easier to put on..?
This appears to be slightly sped up, is that right?
+Mike Kobb Good catch .
No, that's real time Mike.
Sabine Gruber I don't think so. Just look at how things move. Objects don't appear to have realistic inertia. It's not sped up a whole lot, but I believe it's sped up.
+Mike Kobb this may be an old comment but I just wanted to say it looks sped up but it is actually just the lack of air in the room. No air no resistance.
dr.craft 777 I don't think that's right. The people behind the glass in the control room also seem to moving a bit faster than normal.
So, dont read this if you're someone who likes thinking the safety rules in the chair are important.
-Most crashes either result in all passengers surviving or only a few surviving (usually based on angle of impact, speed and seat location).
-Passing out at high altitude is fine and even expected by the airline, they know there's a good chance you won't get your mask on, the plane flies low enough it can reach breathable atmosphere before you die.
-The majority of accidents happen in the first and last five minutes.
-birds and sleep deprivation are the real killers.
-your pilot is a connoisseur of energy drinks and coffee.
-so is the person telling your pilot what to do. (Atc)
What does that do to your inner ear and eardrums???
Concorde had much smaller passenger windows than a conventional airliner. They’re tiny by comparison.
The idea was that if a window blew out, the smaller area would slow the rate of decompression.
Fortunately it never happened.
Helps you fall asleep faster.
He did better than the Byford Dolphin test.
Right! In an air-/spacecraft the change of pressure may be up to „only“ 1 atmosphere. The poor guys at Byford Dolphin had a pressure change of 9 atmosphere.
@@Sunflyer54 Damn, how can one even survive that? Even in a controlled environment with medical experts on standby, I imagine the risk of death is significant.
@Luka well, funny you say that actually, because the guys at the byford dolphin...Didn’t...survive...like, at all...apparently it was one of the most gruesome accidents in human history.
I’m assuming he had ear protection in, but if not did he sustain any ear injuries?
I saw this during training at an airline years ago.
Never took the practice test
wife: " Hey honey, how was your day??"
his day :
dude that is WILD. you literally dont even have time to put the mask on... he actually didnt even make it to putting the strap around his head. that guy is dead if hes a pilot.
So, then would it be advisable to hold the mask to your face rather than futz with the strap.
Right!
Woow thats crazy.
I will never put myself into a situation like this
He got the mercedes bends!
Is this the opposite of a scuba diver getting the "bends" when they ascend too quickly?
I wouldn't say that this is the OPPOSITE per se. The bends is a form of Decompression Sickness caused by nitrogen bubbles lodging in places where they ordinarily wouldn't be (joints, spinal cord, blood and then places where blood deposits gases), whereas what you witnessed here is lack of adequate oxygen... kind of. (there's more to it than that)
@@melissachartres3219 Thank you for your reply. Even as a child I would wonder about things like that. My father was a wealth of knowledge because he read a lot and he would talk to me about things he read even when I was a preschooler. I think he would have loved the internet. Also I plan to learn more about this in the future.
@@annehoskins5795 Smiley face emoticon! YaY! Thanks for having gotten back to me... and YES... please continue to educate yourself throughout your lifespan... it will almost assuredly increase your absolute wealth.
Payne Stewart comes to mind.
CZcams be givin you those low quality g(old) videos
I always wondered, if there is decompression in a plane can it affect the organs? Like for example collapsed lungs and such?
Nope. It's not that much of a pressure difference. Almost none in fact. Even if it was a vacuum. It would be like diving 10 metres beneath the sea and then resurfacing
@@AverageAlien that can't be right, sometimes when going up a mountain in a car, if you go up too fast you can feel your eardrums pop, if a window of a plane breaks won't a lot of stuff get sucked out? Isn't that why even if the pressure of the plane is not sea level, you bags of potato chips and your feet inflate?
@@dutelatte2154 Yes, but that's absolutely nothing and will hardly affect you outside of your ears popping. If there is a small exit point for the air to get out, like a window, there will be a lot more suction, because all that air has such a small place to get out from.
If the pressure change was extremely fast like when a bomb explodes, or you instantly teleport to the outside of the plane, then yes, your lungs will explode, wikipedia says that with 0.69 atm of pressure change that happens, However if the pressure is released slowly, like in this video, then the air will come out of your lungs slowly and there will be no physical damage. at 45000ft that would be about 0.75 atm
So much for the air devices the fall in a airplane during decompression
Can anyone explain this for dummies? I have no idea what's going on
You can learn things you never learned in school from this comment section alone
Imagine explosive decompression while you’re taking a dump 🧟♀️
Sucks the shit right outta ya
I experience explosive decompression in my ass every time I take a dump.
That was terrifying
Did he pass out? It looked like he was holding the mask to his face to start with, so why did he not get enough oxygen?
Would take a few seconds for the oxygen to actually do anything he simply passed out before it could be absorbed into his body
@@Myemnhk What's surprising is how quickly he lost the oxygen already in his body and passed out. It can't all be due to lack of pressure, as fighter pilots often fly at or above 45,000ft with just an oxygen mask.
@@Pete856 well fighter jet cabins are pressurized, not the same amount as passenger planes but they are pressurized. Since they aren't pressurized as high as passenger jets they still need supplemental oxygen at certain high altitudes, but it is nowhere near fl450. Since the concentrate of a gas in a liquid is directly related to the pressure since the pressure dropped the concentration of oxygen in the blood dropped too, it was only so fast because the pressure was so low. If it was like 25000 feet and not 45000 you'd be conscious for 3-5 minutes before you pass out from oxygen deprivation. Look up henrys law if you want more information I don't know much about it to give a better explanation.
Considering that most civilian airliners won't fly above FL420 (around 42,000 feet pressure altitude) I'm guessing that this demonstration could be considered extreme for most civilians undergoing a course or training at CAMI.
Can people not hold their breath or go for 30 seconds without a breath and still be able to function? Seems odd.
Oh yeah just choose not to pass out from you’re brains farting. Duh. Nice one James
legit question can you hold your breath of would that not work? i get why they get like this but can holding you breath buy you time?
That's a quick way to get a burst lung! Trying to keep 1 bar in your chest whilst a pretty good vacuum is pulled around you wouldn't do your lungs much good.
It's why you have to keep breathing whilst ascending from depth whilst diving. The only exception is free diving because you start with one lungful only.
What would happen if you took a big deep breath as it happens and hgeld it till you had your mask on?
That kind of brutal decompression also affect the ears, right ??
The immediate onset of tonic-clonic seizure at unconsciousness is disturbing.
Im not flight expert nor do I claim to be but may I ask what is happening?
I volunteered for this 🪨
Not like diving where the pressure is far more intense and you have to use a special nitrogen oxygen mix to dive under extreme pressures.
Haha... Dont put me wrong...
The guy approaching him for checking and emmidiately putting his mask on, felt like a sneaky robber 😂...
And there should be multiple buttons to eject oxygen masks in an airplane, like one at cockpit, one at management and hostess staff so that it can be quicker.
they deploy after a loss of cabin pressure, no button needed
@@popcorn8153 hmmm , but if it fails, people on board are dead for no reason
@@auroralshine6176 Masks deploy automatically when there’s a decompression, but some airliners do have controls on the flight deck and cabin crew positions incase they fail to deploy.
@@auroralshine6176 I know for a fact the 737 has a switch on the overhead panel on the flight deck.
@@muttley8818 let’s be real
If they did fail to deploy it would be too late to push the button for the passengers
You would just have to descend and hope it’s not too late
Now it makes sense why you must put your own mask on before helping others!
I've seen the question already asked, but the answer given didn't explain much. Why would you pass out so quickly at altitude? The average adult can hold their breath for much longer than 5 seconds. I fail to understand why depressurization would have such an effect.
You wouldnt be able to hold your breath because it would expand and leave your body with as much pressure as 1 atmosphere. Gasses have more kinetic energy than liquids. Gasses which are dissolved in liquids (like oxygen in blood) stay in the liquid because there is enough gas pressure from outside the liquid to keep it in there. Once the pressure outside the liquid is gone, the dissolved gasses bust out because of their relative higher energy. Also, your blood oxygen levels need to be higher than something like 85% for your brain to work right and we sit at 95%-100% normally. You dont breathe to force air into your blood, you breathe to exchange new and old gasses. The pressure of atmosphere is what forces the air into your blood and prevents it from escaping too easily.
Why couldn't the person just hold it up to his face? Keep it in place until he's comfortable enough to put the straps on.
wait wouldent u be in pain cuz the blood in your body is trying to get out of of the air in the blood?
Thought he'd turn into a byford dolphin there for a second.
What if you hold your breath?
Some people may not understand that they don't understand. This comment is to make sure that you understand that.
The one thing I take away from this, if someone who’s prepared for what’s happening has this much of a problem, can imagine the shitshow on a real passenger aircraft.
During the safety briefing on passenger aircraft they really gloss over the importance of putting your mask on before anyone else’s. Like, they should stress, “You risk your own life by trying to help others before putting your mask on. You MUST put your mask on before helping others in the event of a decompression.”
I always put on that oxygen mask before I even buckle my seat belt and we're still at the gate. I've been kicked off many a flight to my dismay.
At 45000ft, the pressure is roughly 200mb and temperature -60°C.
yeah you need gloves
I read it as "Effect of rapid depression"
Great video about this by Smarter Every Day
The recent space flight elevator rides, by Virgin Galactic and Blue Origin, may come to an abrupt end should their craft suffer a sudden depressurization. The passengers do not wear pressure suits so they will be subjected to the virtual vacuum above FL450. Their apogee goal is to travel beyond the Kármán Line, or 100KM above the Earth.
it happened before, soyuz 11. at 160KM a valve broke during separation, and the cosmonaut trio were killed in just over 100 seconds. the first people to inhabit a space station. after that, no more shirt-sleeve re-entry for soyuz crews.
my left ear felt that
they expect one of us in the wreckage brother
czcams.com/video/fLFAXvFYhsE/video.html
Definitivamente había que mejorar esas máscaras. Hasta el tipo de seguridad tuvo problemas.😬
it's best to breathe first, n strap in later..?
Why does he go out so fast if someone could say hold breath for say 30-40 seconds?
Holding your breath in a near vacuum would likely cause you so much pain in the chest you would violently exhale. Then you're stunned and unable to even gasp for air.
Did he get the bends?