"we largely resolved these concerns by ignoring them" 😎love it

@mithrandirthegrey7644

3 ай бұрын

Sounds moronic to me. Imagine your pilot saying this before you take off.

@Drimirin

3 ай бұрын

@@mithrandirthegrey7644 Sounds similar to things a certain submarine pilot was saying not so long ago.

@pieroo7

3 ай бұрын

@@Drimirin what happened to him?

@samhodge7460

3 ай бұрын

@@pieroo7 He and his four passengers died from a catastrophic implosion. Look up the Titan submersible. The pilot/founder of the company ignored countless safety regulations in the name of "innovation".

@mithrandirthegrey7644

3 ай бұрын

@@pieroo7 He's talking about the Titan submarine that imploded near the wreck of Titanic.

12:40 I kinda feel like the room didnt appreciated that joke appropriately

@horwoodg

2 ай бұрын

You have to be of a certain age I think, I got it and I'm getten on in years.

@divingtalks2566

Ай бұрын

Check out the other Talks. There were other really interesting ones. For example the the two about the underwater habitats: #DEEP by Phil Short - another highly skilled diver, and #PROTEUS by Brian Helmuth. Both worth watching.

I’m not a diver, but I was a respiratory therapist who worked in a hospital hyperbaric medicine area for a while. This is absolutely bananas and I love every minute of it. So awesome.

@divingtalks2566

2 ай бұрын

That’s a cool comment! Take a look at the other Talks, many more interesting topics.

If you are going to mix hydrogen and oxygen in a plastic bag always put the oxygen in first. Don't ask me how I know that....

@AstralWarrior

4 ай бұрын

How do you know that? 🤔

@xiro6

4 ай бұрын

​@@AstralWarriormaybe static discharge blew it, while oxigen will just burn the bag. But maybe, i really dont know.

@parkershaw8529

2 ай бұрын

Simply because we are in an oxygenous atmosphere.

@nastropc

2 ай бұрын

Otherwise it will float away?

@karlmckinnell2635

2 ай бұрын

Any thoughts on a fuse🤔

Heli access/remote/cold/camping/cutting edge tech diving/super exotic gas mixing/water tank habitats/ 16 hours of cold water deco. Zero tolerance for a failure 250 Meters/800 ft bottom Hpns In the 80s I worked on many Sat vessels in the North Sea so I’ve an idea of the reality of these dives. Gobsmacked Fkkkn A Really impressed

@nickb220

3 ай бұрын

what

@AsianManZan

2 ай бұрын

Don’t worry buddy. Fellow diver here. I get you. I did the same in the gulf. I moved to inland and joined the union. Way different. Enjoy your retirement!

@divingtalks2566

Ай бұрын

It was quite an achievement, indeed. Check out the other Talks. There were other really interesting ones. For example the the two about the underwater habitats: #DEEP by Phil Short - another highly skilled diver, and #PROTEUS by Brian Helmuth. Both worth watching.

Very interesting. Thank you for sharing and feedback. For my part, during my dive at -312m in Font Estramar cave, with a trimix 4/86 : I only felt very weak HPNS. Exercises allowed me to check my lucidity at different strategic depths. Concerning the density of the gas breathed of 8.56 g/l ( -75,60m air equivalent ), the Joki being a very flexible rebreather, I did not feel any discomfort at -312m. Regards Xavier Méniscus

@divingtalks2566

4 ай бұрын

Thank you for your comment. That strategy you used to check how you were during the dive is a very interesting piece of information. I hope we can discuss other important topics, Xavier, in a near future. 😉

I’m not even a diver and this BLOWS my mind!!! Humans go hard I love watching innovation and the limited get pushed

@divingtalks2566

Ай бұрын

An incredible achievement. Watch some of the other talks. They’re great!

“We dealt with those problems by ignoring them” this is a sentiment I can co-sign, love the … lecture ?

That presenter was as focused and clear as any I've listened too. Also if there's a level beyond amazing this was it. Well done folks.

@divingtalks2566

2 ай бұрын

Thank you for your kind words. This is the type of content and presentation skills we want to have on our show. Watch some of the others. More interesting content being shared in the Diving Talks KZread channel.

@R.Daneel

2 ай бұрын

I came to say the same thing! What a great presenter. I'd have watched an hour on the advancements in paint-drying technology.

@divingtalks2566

Ай бұрын

Check out the other Talks. There were other really interesting ones. For example the the two about the underwater habitats: #DEEP by Phil Short - another highly skilled diver, and #PROTEUS by Brian Helmuth. Both worth watching.

Aussie hydrogen mixture backyard testing is the best testing period!

@izelennkhan1887

5 ай бұрын

Did you just call a Kiwi "Aussie"?! #triggered #justiceforthekiwis

@YZFoFittie

5 ай бұрын

​@izelennkhan1887 they get so pissed! LMFAO

@MegaEpicLlama

5 ай бұрын

@@izelennkhan1887 Aren't Richard Harris and Craig Australians?

@zorbakaput8537

5 ай бұрын

@@MegaEpicLlama Now you're putting the slipper in LOL.

@Ilych367

4 ай бұрын

@@MegaEpicLlamarichard harris became an aussie when we decided that his work in thailand and subsequent fame was worthy. you probably won’t get the joke but australia will claim any kiwi who gets famous enough as an aussie

ended with a total banger

Brilliant! Great to see these new innovations happening in New Zealand. I remember one of the early dives into the Pearse resurgence by Kieran McKay, Pete Hobson and Dave Weaver, that ended so tragically for Dave Weaver back in 1995. Things have come a long way since then.

For the rest of us, theres a snorkel. Beyond that theres the common scuba tank. And if you still want to push the boundries watch a cave diving video on youtube.

@bullschitt3666

5 ай бұрын

We used to push our common scuba tanks with air down to 220 ft. All this tech stuff seems dangerous to most, but for what we were doing it would have been much safer 😊

@gasdive

3 ай бұрын

​@@bullschitt3666 haha, I was diving air to 260 ft and had friends diving 330. Helium was an absolute godsend.

14:35 that group photo kind of says it all right there....

@divingtalks2566

Ай бұрын

Check out the other Talks. There were other really interesting ones. For example the the two about the underwater habitats: #DEEP by Phil Short - another highly skilled diver, and #PROTEUS by Brian Helmuth. Both worth watching.

At the end of the Younger Dryas, Sea levels rose over 400 ft. On our deepest dive, we can barely see what was the shoreline before the Younger Dryas.

@JohnnyDanger36963

3 ай бұрын

At the end of and after noahs flood.

@Secretgeek2012

2 ай бұрын

​@@JohnnyDanger36963 🙄

Balls of steel on these guys. Very interesting talk.

@divingtalks2566

3 ай бұрын

Thank you. Please check the other Talks, too. Many more interesting topics by other Speakers.

Great presentation. Anything about the Pearce resurgence exploration is gold. Thank you and be safe (as much as possible :))

First of all, this is amazing diving and I'm really grateful for you sharing your knowledge Dr Mitchell, and the team overall sharing their incredible adventures with us all. I know that having a wildly incorrect PPO2 in the loop is bad for plenty of other reasons, and these are really weird dives anyway for example closed curcuit bailout, extreme decompression requirement etc. But you have to admit there is just something terrifying about oxygen and hydrogen together in a compressed cylinder. Also, consider what could happen if the PPO2 increases in the loop beyond the lower flammability limit. We know already from oxygen incidents that small flakes of chrome or other contaminants being thrown through valves and first stage regulators can function as an ignition source, I just shudder at the possibility. Just off the top of my head, the introduction of H2 creates a whole class of new hazards that no one has any experience managing: - The loop that isn't being breathed can still cause problems if it's PPO2 isn't managed correctly. - PPO2 mismanagement by a buddy could cause problems for you - A blending error could result in an explosion much more energetic than simple overfilling Good luck to you guys, but I'm glad I'm not the one taking these first steps.

@divingtalks2566

5 ай бұрын

Happy to share what we saw in person to the world!

It's mind boggling how advance these guys are

Not a diver (not even much of a swimmer), the thought of cave diving terrifies me. Even watching skilled and experienced divers do it fills me with a mild dread. But this was absolutely fascinating. Every once in a great while the algorithm makes an outstanding recommendation. … something, something broken clock. 👍

@divingtalks2566

Ай бұрын

It’s an acquired taste. 😀

@divingtalks2566

Ай бұрын

Check out the other Talks. There were other really interesting ones. For example the the two about the underwater habitats: #DEEP by Phil Short - another highly skilled diver, and #PROTEUS by Brian Helmuth. Both worth watching.

It's easier to stay alive in orbit above the atmosphere than it is doing these sorts of cave dives - there is a lot of exploring still to be done below us. I was on call for work when I watched this and am happy I did.

@DustWolphy

5 ай бұрын

I still don't understand why they don't just use robots.

@dwaynesykes694

5 ай бұрын

@@DustWolphy water strongly attenuates radio waves, so that won't do for command and control. Sound-based systems work in open-water, but have quite low data rates measured in characters per minute that aren't at all suitable for video or realtime control and likely wouldn't work at all inside a cave environment. That leaves tethers, which is what all underwater ROVs I'm aware of use. The tether makes supplying power and sending signals easy, but it also makes the system impractical inside a cave due to entanglement issues. I've pondered the possibility of a cave-specific ROV that has on-board power and uses an on-board spool of fiber as the tether. Having the ROV unspool its own tether as it progresses should eliminate the entanglement and sheer friction issues with having the ROV try to drag a kilometer of cable behind it. Beyond that, there's AI, but where's the fun in that. Also worth noting that some company has already made such an underwater drone. They send it off on its own and it maps the cave, then it comes back. There's no realtime information. Ultimately, some humans have always been explorers. Why go there? Because it's there.

@chrisjames7803

5 ай бұрын

@@DustWolphy wheres the adventure then? the one thing weve done since we learnt to walk as early homonids thats EXPLORE!!

Kudos for pushing the boundaries and advancing diving. Fascinating talk!

Absolute mad lads

This was an amazing slide and documentary!!! Thank you for sharing!

@divingtalks2566

4 ай бұрын

It’s our mission. We promote the show and share it with the world, for those who can’t attend.

That explosion was more than hydrogen, as we all had that high school science teacher who would ignite a balloon and hydrogen burns slow with zero shockwave... until you load it up with oxygen.

@zdwlees7647

5 ай бұрын

Yh they probably did the optimum ratio 2:1

The ignition energy of H2+O2 can be as low as a few millijoules, a spark that is essentially undetectable, and easily in the range of what you can create by walking across a carpet or unrolling a few inches of cellophane tape. Scares me and I'm fearless.

@martonlerant5672

5 ай бұрын

Well thats how the swedish inventor of hydrox died. Hydrox mixtures that ain't hypoxic at surface pressures go boom. Sure, if you are deep enough hydrox can be safe. However using it at high concentration is just an elaborate suicide.

@chadx8269

5 ай бұрын

Agree, milli-joules from rubbing plastic tojether. The high humidity of the rebreather environment helps reduce static discharge.

@r0cketplumber

5 ай бұрын

@@chadx8269 Also, in fairness, IF the test at one atmosphere used the at-depth trimix with 3/67/30 O2/He/H2, that is similar enough to the Tridyne 2/88/4 mix that is sometimes used for rocket tank pressurization- the O2 and H2 are too diluted by the helium to combust at all, and can only react when passed through a platinum catalyst (this makes warm gas to fill the propellant tanks as they drain). Dilution can knock out one leg of the fire triangle, but precision is mandatory. If I were doing that project, I would have done the first trimix test in open water near a shore facility with a decompression chamber instead of in the ass-end of nowhere with no hope of rescue. But then, you'd have to hold a gun on me to get me to dive in a cave- and I've jumped out of airplanes and even flew aboard a rocket plane multiple times!

Ill never go diving in my life i dont think. But this was still very interesting

Great presentation- pioneering work. Thank you

Wow! Truly amazing.

Only here looking for Gus and Woody🐙

If temperature is a problem you can soak your wet suits in argon for a few hours before the dive or use it directly in your dry suits. Gives you quite a bit more headroom regarding temperature because of better isolation...

Fascinating!!

Thank you for sharing this with us, great job. It seems like we may need more explosion-proof rebreathers in the next years...

@charlescouncill

5 ай бұрын

That’s why I don’t smoke when diving with a hydrogen mix gas.

Amazing!

I love it, a comprehensive testing programme, brilliant. 🤣🤣

Incredible work! Look forward to the paper publication on this.

Really great presentation!

Simon, As always, your presentations are gold! Really interesting [boys own] science going on here.

@divingtalks2566

26 күн бұрын

They are. By the way, Simon is coming to Diving Talks again this October. Join us in Lisbon. 😉👍🏼

You guys have balls. I cave dive and it is nothing not even close to what you do! Nice work!

@user-sp4gy7ko5l

5 ай бұрын

You both have a death wish.

Wow this was fascinating!

Keep at that science guys, as rebreather diver this is awesome

Thanks for sharing

Brilliant!

@divingtalks2566

5 ай бұрын

Indeed!

Neat!

My anxiety just sky rocketed the deeper you went. Amazing footage and kudos to you guys.

@divingtalks2566

2 ай бұрын

Huge achievement for the group of divers portrayed in this Talk! Check out the other Talks. Many other interesting topics presented at the show and available in our channel.

really interesting talk!

'we dealt with the problems by ignoring them' True beacon of safety right here

@divingtalks2566

5 ай бұрын

You have to understand that statement in the context of the presentation.

Everything about this is nuts, delightfully insane.

Fortune favours the bold.

Very interesting to watch how those kinds of dives are done. Great presentation.

@divingtalks2566

Ай бұрын

It is indeed; a great presentation about an incredible achievement. What the other Talks. Many more interesting topics!

Great talk. Thank you.

@divingtalks2566

4 ай бұрын

Good to know the Talks are reaching to a wider audience!!

Just awesome… Thanks for the video.

@divingtalks2566

3 ай бұрын

Thank you. Check the other Talks. Many more interesting topics by other Speakers.

Your team is awesome. I’ve followed you for years,maybe since very shortly after you first reported on Scuba Board.

@divingtalks2566

26 күн бұрын

Cool. Join us this October in Lisbon. Simon is attending and presenting one more time. It will be great. 👍🏼😊

Truly a difficult task to solve. Would prefer building a micro submarine versus this method. The substantial volume of tanks needed plus issues with hydrogen & extreme temperature is beyond simply challenging a diver.

My favourite part of the video was 21:35

I'm not sure if it was just the atmosphere in the room, but I feel the live audience didn't fully grasp just how incredible this actually is. I'm not a diver but I've always had a keen interest in the science and engineering involved. It's been an open secret for decades that using hydrogen would allow divers to push the envelope of dive performance. It's just very few people have had the courage to try it. I do have experience with industrial chemistry in the mining industry and manufacturing and I especially enjoyed the initial tests Harry did. As someone who's accidentally caused a small hydrogen explosion (twice) before I understand the apprehension. As humerous as the anecdote of not annoying the wife and the overall jank of that setup is, this is actually a textbook example of pushing the absolute limits of experimental and technical performance in a responsible and calaculted manner. All that helium and the low oxygen % is a really clever way to reduce the risk of turning your own lungs into an underwater bomb. It might seem crazy how easy it is to get hydrogen but you can actually access a whole load of extremely dangerous industrial reagents in Australia with virtually no hassle. You can get hydrofluoric acid, nitromethane and a bunch of precursors that you need special permits for in NA or the EU.

@divingtalks2566

2 ай бұрын

This dive was an amazing achievement and everybody that attended locally was aware of that.

😂 The flammability/explosiveness test was a right crack up. The old beaker in a bucket of water and bubble a SMALL amount of the mix in there then use piezo igniter from a bbq lighter would of been way to go but I don't blame him if he done half a job there deliberately, we know the margin is too close and a mistake puts you over so I'd wait till after the dive and just make a bang too.

@AshlarPhoenix

4 ай бұрын

I cringed when i saw how much H2 was in the bag was and how close he was getting to the fire... OMG, ear-drums ringing in empathy. Ouch!

Impressive.

What a fascinating presentation. Thank you. I’ve no experience of anything you and your colleagues do but I have a science background, and have the utmost of respect for you. Please keep on trailblazing. One observation, why is it that there are no younger divers involved? Clearly you have vast experience. Is that it? Or is there a degree of madness too :)?

@divingtalks2566

26 күн бұрын

Good point there. The ageing of diving community. That is something we should address through a serious and participated debate. But here, for the complexity of the dive, you would expect to see more experienced divers.

I'm surprised this is only now becoming a thing. I remember first reading about oxy hydrogen diving several years ago. Probably in 90s IIRC.

@lancehoward3990

5 ай бұрын

I can't help but think if Dave Shaw had this mix, he'd have come back alive. As soon as the speaker mentioned the density problem at depth, my mend went to Shaw and Bosemansgat.

wow! there's only been a handful of these dives since 63 or something. it's an avg of about one attempt per year since hydrox was implemented. The human body is so elastic in the manner of adaptation.

@Adrian-vd6ji

5 ай бұрын

lets not forget the human mind (real star of the show)

@eljanrimsa5843

Ай бұрын

@@Adrian-vd6ji you just say that just because you haven't seen what the lungs look like at those depths

awsome dive and associated planning the lack of testing for flamability at the 300m working pressure is a bit of a concern for me - I am imagining a little grinding of teeth prividing energy for ignition and "boom" = what a "face off" and you did not test for this, "she'll be right, HH tested it in his pool" - really glad my concerns were not realised on your dive, but I think you need to do some proper homework on this remember the carbon fiber sub that did many successful deep dives whilst not understanding all the technical / structural issues - all good till it is not

@dwaynesykes694

5 ай бұрын

What Harry's keynote speech from Rebreather Forum 4. He goes into much more detail. He compiled an entire team of specialists in a variety of fields to consult with regarding the usage of hydrogen. Regarding the flammability concern, it's not one at

@zdwlees7647

5 ай бұрын

​@@dwaynesykes694could you clarify a bit further about the risk going drom Heliox to hydrox? Did the Helium begin to diffuse out too fast causing DCS?

@dwaynesykes694

5 ай бұрын

​@@zdwlees7647 Harry's dive was a complete success; no DCS was experienced. His time on hydreliox was quite limited before switching back to his 4/90 trimix (i.e. 4% oxygen, 90% helium, 6% nitrogen). The concern is what's known as isobaric counterdiffusion (hereafter referred to as "ICD", which can result in DCS *without pressure changes* (i.e. constant depth) when a gas change results in the newly added gas diffusing into tissues while the removed/diluted gas diffuses out of tissues. The rate of "offgassing" is increased by the "ongassing" of the newly added gas, that's basically the premise of using oxygen-enriched gas for decompression. If everything works out well, switching from hydreliox to trimix will actually help speed up decompression thanks to ICD. That said, like any decompression, if done too aggressively it opens the door to DCS. The COMEX experiment referenced was an experimental saturation chamber dive and resulted in multiple instances of DCS resulting from ICD due to a rapid heliox/hydreliox gas switch _despite maintaining constant pressure/depth._ That establishes that ICD is a very real risk which gas changes to/from hydrogen-enriched mixes. It can be argued that the COMEX dive was at full satuation and so ICD isn't as much of a concern with bounce dives; however, at the depths these folks are diving to the faster tissues, which includes highly-vascularized organs like the brain, are more or less at full saturation and are even at a supersaturated level on ascent. Hopefully ICD ends up being an asset to decompression and not a huge risk, but the near complete lack of data makes it all a huge unknown right now.

Surprisingly negative posts in the thread. Experimental is experimental but there is a history of hydro hydreliox diving 500 to 700 metres. According to our friend wiki this is the 54th such experiment. With COMEX having simulated 701 metres my only question is.... When do you plan to go deeper?

Great to see people pushing boundaries, i recall ida-73 kicking on ebay few years back, was tempted to buy it, but spent all cash on boris. So looks like Russians also experimented with H2, i have one of the manual depth gauges calibrated to 300m. it would be interesting to read through some of their documents.

Think everyone has the same reaction watching the last vid ‘f*** hell!’😂

Looks like our exploration of the water filled caves below the Earth may be making leaps and bounds . Guess this will also have a float on effect to commercial deep saturation diving. Interesting times ahead indeed.

Is the documentary Dr. Simon mentioned at 18:59 called Deeper? Is there any information on it like release date?

@DrHarryH

5 ай бұрын

Yes, just announced by Screen Australia today. Hopefully will be at cinemas next year.

@abaDive

5 ай бұрын

@@DrHarryH thank you Dr Harrison. Appreciate the reply from the man himself. That is great news, such an admirer of your work, will be awaiting eagerly. Wish you all the success.

You have to ask why an extreme tech dive exploring mixtures took place in a remote cave. There must be less o2 in new ze.

I think there are statistics for hydrogen oxygen mix flammability and explosivity, but in relation to its use as lifting gas in airships. Harry might have wanted to check out that information before his backyard experiments.

What about xenon? It is considered an ideal anesthetic gas…no cardiac effects, no agonistic or antagonistic pharmacological effects with other anesthetic drugs…and its induction is smooth…it’s just expensive…I wonder if a small amount could be used? It is heavy…I know of it from the anesthetic side obviously and am not even an armchair diver…so I’m just asking those who know…? I am an emergency nurse and studying for my emergency nurse practitioner…I don’t handle gaseous anesthetics obviously but we must understand them…so I ended up here…and we do get divers of course from diving clubs and those in the Chesapeake Bay and Atlantic Ocean off boats…

Wow. You guys have humungous nads though; Oxy hydrogen mix under pressure sounds sketch. Wonder how much humidity helps prevent unplanned exothermic events.

You mentioned a documentary that's being made, who is making it where can I find it!? Thanks!

A glimpse into a world that might as well be another dimension. I understand the science, but I am so claustrophobic that the mere thought of being underground makes me unwell. I respect the folks that can do it, but it seems purely for sport though.

@divingtalks2566

4 ай бұрын

Divers are the new explorers. This group the top of those. Underwater there’s a whole new world to discover.

The production team Finally switched to PIP right as I was about to exit 🤣👍🏾

You crazy bastards! We talked about this for YEARS! You did it. I'm gobsmacked.

As much visibility as disturbed cave silt - diagrams at the beginning?

2:40 well, how much difference would thermoelectrics make? can your bodyheat power a peltier chip enough to warm your extremities?

@divingtalks2566

Ай бұрын

All great questions. Simon is once again coming to Lisbon for the Diving Talks October 18-20 . It's your chance to come and ask these questions to the man himself!

Why didn't you test the flammability of the mixture with a cheap 30 bar pressure vessel with an electric spark generator inside? Easy enough to find a spot far from anything on some open farm land, and fill the test tank with gases remotely. Watch the whole thing from a good distance.

wow great talk

@divingtalks2566

2 ай бұрын

Thank you. Watch the others, too. And the Q&As. Lots of interesting discussions with Speakers and audience.

When we quit thinking primarily about ourselves and our own self-preservation, we undergo a truly heroic transformation of consciousness.

I know nothing about diving but this looks too cool!

@divingtalks2566

2 ай бұрын

It is cool. Innovative, advanced exploration, the future of diving? Enjoy the other talks, too!

@wilhellmllw3608

2 ай бұрын

​@@divingtalks2566 Gonna do!

@DIVETALK pretty cool!

@divingtalks2566

2 ай бұрын

@DivingTalks, not DIVETALK! Watch the other Talks. Different and interesting topics on our last event!

I was under the impression that H2 is pretty reactive and reacts with O2, so very surprised it would be tried in an underwater breathing mix.

@georgewatson5197

5 ай бұрын

O2 percentages are tiny < 4% generally. The gas is only breathable at tremendous depth.

@WineScrounger

4 ай бұрын

It does form an explosive mixture with oxygen, but it requires an ignition source to actually light off. I'm not sure what the explosive limits are under pressure.

@georgewatson5197

4 ай бұрын

@@WineScrounger It can be ignited by adiabatic heating.

You guys should have nuno gomes on! Hats off to these gents, pure legends, would love to hear input from someone like nuno on the groundbreaking work these guys are doing

@divingtalks2566

5 ай бұрын

Maybe we will have him soon 😉

@user-sq5oq2hd3w

5 ай бұрын

@divingtalks2566 Many thanks for the feedback! Should be really interesting, the guy was known for diving past 100m on just oxygen with ease, that coupled with him also having pushed the limits of mix diving should make for such a fun chat/discussion regarding the potential benefits of hydrogen on the nervous system at depth. Again, hats off to Richard Harris and company, takes some gargantuan nads to do what they are doing, loving the discovery of the pearse.

IM LISTENING

Wow, seriously pushing the limits. Has this cave been mapped by ROV?

@divingtalks2566

Ай бұрын

We don’t have an answer for you. Maybe someone of the team joins the discussion and clarifies.

Two many variables to go wrong for me, but of course I’m sitting on my couch!

Scary

Amazing presentation. When is N = 2 happening?

@divingtalks2566

5 ай бұрын

That’s the question!! 😎

was hydrogen purified to be safe to breath at depth (to ensure it doesnt contain any toxic gases which are not a problem for other uses) ?

@JFMNT

5 ай бұрын

I think it would be safe to assume they were purchasing the 5 9's (pure bottles of hydrogen ie 99.999%)

i just hope to see self resetting scrubber one day ;)

Who mixed the hydrogen and how? Why didn't RH switch to Hydrogen mix at 150?

Now I'm really curious how different it would be to be on Deuterium instead of Hydrogen.

I'm a retired licensed commercial diver - I wouldn't try this; ever. The spark risk with H2 is WAY too risky. Unless they ensure that every single metal component is constructed of brass or some other non-ignition-risk material I really think they are pushing their luck. There is research and adventure here to be sure but they appear not to have conducted sufficient risk assessment; good luck to them though as it's interesting stuff. I'll just admire from the side lines if thats OK....

@saar144

5 ай бұрын

Does that include the tanks as well?

@Mp57navy

5 ай бұрын

The MINIMUM amount of oxygen required to ignite hydrogen is 4%. They had 3%. That is also considering 96% hydrogen. They had 35%. Effectively, their mix was 1%.

@ChessPampa

5 ай бұрын

Seems to be a mathematical problem, not to sound like Stockton rush

@ChessPampa

5 ай бұрын

In the nature of chemistry

@davidporter9131

5 ай бұрын

In a hydrogen oxygen mix, 80H2:20O2 you can smoke a cigarette.

Oxygen in the atmosphere is approximately 21%. Given that what they were breathing was 3%, yes it may have been flammable, but not ''explosive''.

Idk about you, but I'm a little nervous about an o2 h2 mix under pressure. Definitely wanna be Watchung you Po2 with this setup

@saar144

5 ай бұрын

How is the PO2 relevant to this discussion? You will get the same PO2 regardless of the mix you’re using, it is only affected by the % of O2 in the mix.

@ianirwin9480

5 ай бұрын

@@saar144 combustion calculations rely on partial pressure, if you're running a pO2 of 1 there is more than enough oxygen to cause an inferno if a fuel like hydrogen and a spark are present

🤨breathing fuel and oxygen. diver: WOW! what an amazing dive, now i need a cigarette...🔥

@divingtalks2566

26 күн бұрын

Ahahahah you shouldn’t smoke. Diving or not diving. 😉😊👍🏼

Well, avoid anything catalytic, platinum, paladium... whatever can make H2/O2 mixture go boom without any external energy source. But awesome, that people stop wasting precious Helium!

@zdwlees7647

5 ай бұрын

Yh I was wandering about the potential for catalytic ignition. It definitely happens to high quality platinum and palladium in air with pure H2 gas being blown

Hydrogen is explosive in as little as 4% concentration up to 96% concentration. When hydrogen explodes, it detonates supersonically. All it takes is a spark.

@Mp57navy

5 ай бұрын

That's why they had 35% hydrogen. Literally a 4X safety margin.

@rubikmonat6589

4 ай бұрын

​@@Mp57navy Actually they were 4x above the lower explosive limit, they were literally 4x the wrong side of the limit, deep in the danger zone. The UEL for hydrogen is very high too. A faulty microphone in their comms system it's all over.

@JGZimmerle

2 ай бұрын

@@rubikmonat6589Only if the remaining gas would have been oxygen. But its was 35% hydrogen, 3.5% oxygen, and the remainder was helium. Helium won't react with hydrogen, so the mixture was actually relatively safe. The is assuming that the partial pressure has no influence on the reactivity. As the fatal Apollo 1 plugs-out test of NASA's moon program showed, this is a big assumption.

Richard Harris has a video on his channel on going to depth of 245m