"but they didn't mention any real study with testing completely sealed bags filled with nitrogen or other asphyxiants. On the other hand, people really died from asphyxiation with nitrous oxide"
A few things:
(1) It would somewhat cruel to "test" the completely sealed bag method due to the known human response to carbon dioxide buildup. PPH/PPEH does not need to explain the basic human response which is already known. It mentions it briefly and in passing for a reason but a little more on it for us: the hypercapnic alarm is the
body's physiological response to elevated levels of carbon dioxide (CO2) in the blood aka hypercapnia. Essentially, and a very short version of relevant info on this, when CO2 levels in the bloodstream rise, it leads to
a decrease in blood pH (respiratory acidosis) and specialized chemoreceptors in the body, primarily located in the brainstem and in the carotid arteries, detect the elevated CO2 levels. The body then has
physiological responses by increasing the respiratory rate in an attempt to expel excess CO2, increase heart rate to improve oxygen delivery and circulation, and blood vessles dilate to enhance blood flow to vital organs. CO2 will cause confusion, headaches, diziness, shortness of breath, panic & anxiety. The goal is to do this as peacefully as possible so it seems counter productive to do tests using methods which will heighten anxiety and stress and just lead to someone removing the bag when going into it this is already something we know.
It's pretty clear that flow rate plays a big role in getting rid of CO2 effectively and also prevents oxygen from entering the bag (double/extra win). Whether 15 lpm is the sweet spot or if it could be lower or higher is a bit beyond my expertise. That's why the insights from users who've done extensive oxygen analysis are super valuable to this conversation on top of the PPH's analysis tests. It provides us with a baseline understanding of expelling enough CO2 to not trigger the alarm discussed above, it makes some common sense to me anyways. In theory, sure, you could try different approaches, but considering the serious risks involved—like potential brain damage—it makes sense to find ways to minimize those risks. Reducing errors is always a smart move, especially with something as critical as CTB. Even if it's not strictly necessary, why wouldn't someone want to put in a little extra effort to boost their chances of success and lower the risk of failure? Ensuring a steady flow rate doesn't take much work, and it makes a lot of sense.
As for the current exit bag/gas method, it creates a nearly zero-oxygen environment, which helps induce loss of consciousness quickly and provides a way for exhaled CO2 to escape and not become trapped to trigger the panic alarm. Trying to replicate a zero-oxygen situation could be really tricky with trying to do the method you are discussing as gas could escape when you're putting it on, CO2 would build up in the bag, and sealing it off just complicates things further. That definitely doesn't align with what we're aiming for in terms of being realistic, reliable, and consistently successful.
I do love innovation and new ideas, but as with any CTB method reduction of risks is always a good idea;
(2) Yes, I understand you have found some
isolated incidents of it happening but the cases you mentioned of people who have died certainly highlight sure it has happened, but they aren't reliable or repeatable. Just like the fact I could point to many cases of people dying from drug overdoses, but those outcomes aren't consistent if someone were to take the same doses again. We do know their underlying health factors. We do not know the full circumstances. It would almost be like me saying, "Hey I found the following 10 cases of people who fell off a curb and died" then saying "So it can be done, thus we should explore it more" > that would be somewhat reckless and misguided of me to do. Just because it has happened does not mean it is a good idea for an important endeavor like CTB. Just like, to bring it back around to the bag method now, there are also cases of people suffocating in bags without any gas involved, but using those as examples doesn't contribute to a constructive discussion. Just because something can happen or has happened doesn't mean it's worth exploring further, especially without a solid understanding of human biology and functionality (see point #1 above).
While innovation is always great, it's essential to ground and guide those ideas in a basic understanding of why certain methods may not be ideal on some fundamental levels. Research and development are crucial for any CTB method, but we already have a grasp of how the body reacts to CO2 buildup, which suggests that further exploration in this direction may not be worthwhile. I am not saying it can't be done, of course anything can be done. It is not realistic though.
If this were a method that people could easily do, I would put good money on a lot more instances of success. People are desperate for self-deliverance and in a lot of pain and suffering. If something as easy as this could be achieved with any sort of ease and reliability, it would be done routinely already. Especially for the people looking for a "finger-tip reach" solution.
(3) also, let's talk about that word "necessary" for a second too as far as when it comes to the gas method. It's also not technically "necessary" to say test the tank pressure gauge for CTB success, but relying on an untested tank means putting a lot of faith in its proper pressurization to make sure someone truly has the amount of gas the supplier claims. Even the most reputable stores can and do make mistakes. Why leave it up to chance and faith in another person when a simple extra step can confirm it? Sure, people may have succeeded without testing PSI, but skipping this step certainly increases the risk of failure. Yes, obtaining a gauge incurs some cost and adds an extra step, but it's still a wise decision. Common-sense precautions exist for a reason. When it comes to something as crucial as CTB, minimizing risks and variables is essential. I find it puzzling why anyone would overlook such straightforward steps that can help ensure a smoother process. So I guess the word 'necessary' is subjective. Perhaps the better words is "prudent" "wise" "reasonable" etc could be in play here.
(4) while anything can be 'debatable' it does not mean it is an even debate. We factually already know which is in fact more reliable, it truly is that simple. I am not downplaying the effort and thought you've put into this but take a step back to evaluate it objectively for a moment. And a lot of things "should be easy" but does not mean they actually
are easy. Should be easy does not equal can/will be easy. It's also interesting you would hinge an argument about the flow and claim there isn't "decent proof" yet now want to propose this without decent, let alone good, proof as to it working. Seems a bit wonky and a big leap of logic to do that if you care about 'proof'. It is a little weird to dismiss PPH's thoughtful outline to then try to propose something different and want to call it debatable for reliability, somewhat insouciant. I'm not trying nor mean to argue in any way as I fully respect everyone but I do try to tread with caution and think things through before making assertions and really encourage to think of the ramifications for proposing ideas without thinking them through. But if, by only what you said, you are wanting to propose a different method that is awesome but it is hard to follow the train of thought if you want to then discount knowledgable studies; it is possible to keep researching to find a way to make them possibly align or make sense. But I think the emphasis there is more research for this method given we already have many, many years of research of the existing exit bag scenario. Nothing to be taken lightly for something as important as creating a successful CTB (just my opinion anyways).
Reasonable people are obviously welcome to disagree and discard anything they disagree with and continue on whatever path they want.
I personally, just for me, would rather stick to a method that has substantial evidentiary support than trying to shoot from the hip and pursue something which fundementally is far more difficult to execute and substantially has a potentially higher risk of failure and unknown variables, but again everyone can and should evaluate whatever those might be for themselves. People are welcome to do whatever they wish and can rely on a shot in the dark vs trying something that has some reliability, evidence, stats, proof, and applies basic fundamental reasoning. No one is trying to debate, we are just trying to be reasonable, realistic, and avoid potentially just making things worse off for people than before an attempt. Being mildly cautious at a minimum and not reckless with suggestions is somewhat fair.
I totally agree that for some being able to hide the tank or lift it could be an obstacle for some, in which case it is fine to not want to pursue the intert gas method, but I equally do not think it makes the method you are proposing is a viable one to substitute for it. I would instead look into other reliable methods if the goal truly was to CTB but that is just me. Everyone should make up their own minds based on scientific principles, logical reasoning, and make the best, most educated choices. I wish you nothing but the absolute best of luck with whatever you decide is right for you! Whether someone wants to risk a failure and have potentially long term consequences from the failed attempt at something is their right, but it sounds pretty reckless.
With whatever you decide, I hope you find everything you are looking for and get peace & serenity.