What are the Different Types of Rebreathers? | SCUBA 101
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- Опубліковано 30 чер 2024
- Jonathan discusses the two major types of rebreathers, (semi-closed and fully-closed) how each of them function, and the pros and cons of each one.
This video is for entertainment purposes only, and is not meant to replace proper rebreather training.
#rebreather #scubadiving #scuba
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Chapters:
0:00 Intro
1:26 Semi-Closed Rebreathers
15:49 Closed-Circuit Rebreathers
26:18 Outro - Розваги
You are so awesome Jonathan!
Aw shucks! Thanks guys.
So are yall
He has good taste in T shirts
I don’t think I’ll ever go scuba diving, let alone get into the minutia of rebreathers…but I find this guy so interesting. Excellent presentation - thanks for sharing.
This man has some teaching skills
I am not even going scuba diving but I love to learn! Thank you for this!
Lol, same here! I'm just fascinated by scuba diving and enjoy learning about it, even if I don't do it myself. His videos are the most helpful at understanding things I have found!
Jonathan, this Rebreather series a true incentive for the sport. This video has 17K views. Tht is amazing!
Very clear explanation! I'm a trimix blender but I didn't know how SCR rebreathers worked.
Glad it was helpful!
Awesome, Thanks for the explanation of the types of rebreathers. Great Video.
This was an excellent breakdown! Thank you for taking the time with all of these videos!
You know what? I will be honest. I love how you teach! Don't take it to your heart, Jonathan! 🙂
Thanks!
Great video!!! Very informative as always!!
Always enjoy your content !
Excellent ! so clear cleaver and fun ! love it
Excellent presentation. Thank you.
I watched the "Thai Cave Rescue" and ended up here after! Diving is so interesting love your channel very informative!
Great video thanks guys!
this was such a great explanation!
Very interesting. Learned something new and interesting today.
Excellent video, thank you!
Your series of videos "All about rebreathers" are absolutely perfect! I'm a technical diver starting to think about rebreathers and these videos was excellent as a first step to know an overview about it. Congratulations 👏🏻
Thanks!
This was great, Thank you!
You have a gift for teaching, sir.
Thanks!
Good summary folks. Thanks.
Ordering a sidewinder soon and so excited. Except it will take like 6 months to get because they’re getting so popular. Soon enough!
This helped me out a lot in understanding the difference between the two different rebreathers. My dive shop only trains on semi closed rebreathers so I could never really get a great explanation on why they are different. Thank you blue world team!
You are a great guy!
Captivating lesson. Thank you Jonathan! Edd did a great job :'D
Great video
Thnka you so much ! Very clear explanation !
VERY much appreciated clip.
I've been diving since I got open water certified in 1986. Always avoided re-breathers like the black plague due to dangers of convulsions (although I do dive with Nitrox36).
This clip is a little gem for both divers and non divers and Jhonno keeps the explanation clear. Love your channel but don't forget that not all of the patrons are cave divers.
I figure very few viewers are cave divers! But that doesn't mean they wouldn't enjoy watching cave diving adventures! I watch a lot of videos on UA-cam with people doing amazing stuff I would never do, or don't know how to do.
Great explanation!
Thanks!
New to BlueWorld +, Very well done. Thank you. raphael nyc
Hi Rafael! Is this my compressor Guru Rafael??? Welcome aboard!
As a CCR user myself, great explanation, however I'd say if you're going to CCR route, unless you're doing it for photography you're probably doing dives which have helium in the mix simply due to cost factors.
This video helped me understand why a SCR is diver is on max loop volume where a CCR is minimal volume. Have you noticed just how much of your O2 you use on ascent ?
Would be dope to have Big Blue World production team. Dive Talk, Edd and Mike to all dive Devils Hole in Nevada which supposedly has no ending which Blue World and Mike have explored but didn’t go in there for that reason. Like it’s long over due to attempt that feat with there expertise 🤯 ❤ It’s 400ft plus just saying
amazing sound effects🤣
Very informative video! Are you planning on getting KISS spirit certified in the future for the ocean dives ? Since that unit is so similar to Sidewinder
Honestly I think I'll just use my sidewinder. I really like the feel of the sidemount and the balance. You can use it with pretty small tanks in open water.
this guy would be the best uni prof ever
I did that for 5 years. Loved teaching.
thanx so much
Thanks for watching!
I guess it depends on the SCR the one I use have 2 gas one tank is O2 and the other one is He/N2 50/50 or just He.
It is good for decompression since we can shut down the diluent tank to do a lure O2 decompression at 9 meters
I have never seen Nitrox and I started diving in mid 80s
Really? They have it at nearly every dive resort and dive liveaboard. When it first came into being used, several training agencies, most notably PADI, were dead set against it. They actually called it "VooDoo Gas" to demonize it. It took a while for Nitrox to go mainstream.
Awesome video all the time!
You explained the rebreather so briefly and clearly that beginners like me can also enjoy the contents and learn a lot❤
Awesome, thank you!
Really good comparison and explanation! One question: In a SCR is your MOD simply set by the composition of your primary (only) breathing gas? ie with say a 36% Nitrox you have to protect for a full flush so for a PPO2 of 1.4 bar that's a MOD of 29m? For a CCR then your MOD is set by the leanist of your bail-out gases?
Correct.
Rebreathers are different but they’re all members of the same category of scuba equipment: EXPENSIVE.
Expect to drop between $10k-$15k on a top quality KISS Sidewinder plus all the kit AND the training, and you can easily be out $25k-$30k before you even dip your big toe in the water!
Rebreathers are expensive but a KISS isn't quite that expensive. A sidewinder with a hardwired Petrol dive computer exactly like the one I dive is $5800 retail. You will need a certification course which varies by instructor, but plan around $2500. So, well under $10K to dive. Most people diving a sidewinder are already diving open circuit sidemount and have the various gear for that. But if not, you can spend another few grand on a sidemount rig/regs for it.
@@BlueWorldplus I did mock-up a Sidewinder on the KISS website and added all the bells and whistles possible, and I believe it was just over $10k. So I was figuring that $25k-$30k to get to the rebreather level as literally starting from the bottom with zero scuba certifications and equipment and going up. Sorry about that.
Great discussion!! I have one question on CCR's. As the oxygen is leaked into the system, won't the gas volume in the system eventually burp out excess gas? I've never quite understood how that works, even when you take into consideration the small amount of oxygen being added over the course of the dive, and still not release bubbles..
I'm not a diver, but as I understand it, the body converts the O2 to CO2, and the CO2 gets trapped in the scrubber. This means that the amount of gas in the system would decrease constantly as you breathe.
You metabolize the oxygen.
Nice shirt! Need more content with you, woody, and Gus
Seriously that would be dope or to have Big Blue world production team. Dive Talk, Edd and Mike to all dive Devils Hole in Nevada which supposedly has no ending which Blue World and Mike have explored but didn’t go in there for that reason. Like it’s long over due to attempt that feat with there expertise 🤯 ❤ It’s 400ft plus just saying
@@YourMomPussStink 400ft depth isn't easy but it isn't *that* hard. Check out some of the cave dives that Richard Harris and others have done. Dive Talk reacted to one of his videos of an 800+ ft deep cave dive.
Nice explanation. If you took also the "original" rebreather type first (i.e. oxygen rebreather) it would be clear to see the evolution path from O2 machine to SCR to CCR.
Btw How many diver knows that rebreather is, indeed, much older (1879) invention than open circuit scuba (1942)?
That's true. I didn't think of that because Oxygen rebreathers are not very commonly used. I did use one on a very shallow film project about 20 years ago though.
nice shirt
I just got quoted $1,900 for 5 year service at rEvo factory. Just warning people about that expense if you make the decision to buy a rEvo rebreather.
YIKES!
How do you chose the correct PP for your Heli/Nitro Dil when using a trimix system?
We haven't gotten to trimix yet! Stand by!
the t-shirt
Dive Talk!
Great video! In your opinion, for a technical diver which one would be the better option (SCR x CCR)?
Clearly a CCR. SCRs are limited to the MOD of the gas you use. (Usually Nitrox so quite shallow). They're just gas extenders.
A CCR will mix the optimal ppO2 for each depth meaning you'll build up far less deco, and will get the longest dives out of your gas. Downside is of course they're more complex, more expensive and you'll need a supply of oxygen and sofnolime.
@@Yggdrasil42 thanks
I agree. For technical diving a CCR is the way to go. An SCR is a good tool for an advanced underwater photographer.
@@BlueWorldplus thank you
A fantastic and very informative video.
Is there a price difference between SCR and CCR purchase and operating cost? Also, I assume you are limited to the MOD of the O2 percentage of the Nitrox that you are using…
purchase and operational costs are pretty similar. big differences come in when you look at training requirements and prerequisites as well as what a diver has to do with a unit before and during a dive.
Does CCR have a counterlung too? So it makes bubbles too on ascent?
All rebreathers have a counterlung. That's the thing that allows you to exhale. All rebreathers need to vent excess gas as you ascend and the gas expands due to a reduction in ambient pressure.
@@BlueWorldplus so CCR is not REALLY closed circuit after all :)
How reliable are rebreathers as far as failure is concerned? What I mean is, I'm absolutely fascinated watching cave diving videos, and they do not use rebreathers, or at least the videos I've watched.
Anyone doing very serious exploration, long dives or deep dives is using a rebreathers.
@@BlueWorldplus Thank You. I thought as much but I have read that some folks seem to have failures with rebreathers from time to time, and it's not the most friendly environment to be in when that happens.
I have a lot of respect for you folks who do what you do but this scares me too death.
@@JustAllinOneResource but additionally divers using rebreathers will usually carry open circuit cylinders as backup which makes using a rebreather safer as then there's an alternative supply of gas to get out.... whereas if you only use open circuit then all you have is whats left.
Hi Jonathan. Is that means that SCR maximum depth is limited to the gas you breathe in? So, Nitrox 36 will be 27 m (sorry 90 feet for you guys)
Basically yes, although in an SCR, the actual mixture you breathe has slightly lower O2 content than the mix in the tank because it gets "diluted" to a degree with exhaled breath. So your computer would tell you what you are actually breathing. That will change both as a function of what's in the scuba cylinder and your workload and metabolism. For example you might have 36% nitrox in the cylinder but based on your metabolism, you have something more like 32% in the counterlung. So your MOD would be based on that.
Thank you so much Jonathan! That was exactly my understanding about the subject. You are brilliant. Merry Christmas to you.. and please take a break and enjoy the holidays!@@BlueWorldplus
Now can you teach us to build a DIY rebreather using common household items? kthx
You will need a paper bag, some bubble gum, a milk jug.....
What if you get really deep? Then you can't use air as your diluant as the O² partial pressure would be dangerously high to use. Same applies to nitrogen at even greater depths, I'm guessing this is the realm of Trimix? 3 bottles, O², N² and He and you mix as appropriate?
That's correct. Once you go beyond the realm of air as diluent, you need to reduce the nitrogen in the mix with trimix. And if you go beyond the range of 21% O2 in the mix, you will need special deep diving trimix with less oxygen, which are referred to as hypoxic trimix, because it can't be breathed at the surface (it's hypoxic) because there isn't enough oxygen. We will talk about that in the upcoming trimix video. But we have a video on PO2 coming out in a couple weeks.
Dregger the best lol
i just use compressor. unlimited air and less likely to get benz.
and yes people will claim you can get benz from anything but the fact is people use compressor for 4-5 hours a day reaching tousands of hours without ever getting it.
it is simply safer (normal air mixture at 30-40 psi)
It actually is no safer...but you are shallower because they can't reach very deep. Scuba at the same depth is exactly the same effect on your body.
@@BlueWorldplus obviouse answear but no we swim at around 20-30m which according to the char would lead to seriouse issues quickly (20min) which it doesnt and i have well over 2000 hours which is nothing compared to my fellow divers which spend half a day collecting sand on the bottom of the ocean for concreate construction (they usually dont go that deep for the sand collecting but the fact is they stay 6-7 hours underwater collecting sand by hand in ricebags)
the simple fact is eighter there is a difference between compressor diving and scuba or bends charts are way way exagregated.
What type of SCR do you use?
I used to dive a Drager Dolphin back in the day. Like 20 years ago.
@@BlueWorldplus The Mares Horizon does not operate like the Dolphin. Please take the time to learn the Horizon. I say this because you have the Horizon in your thumbnail. It uses injection much like a CCR and has a minor constant flow. I beg that you use the Horizon and make a review.
Nothing like huffing nitrox for demonstration purposes!
How come when I watch ppl dive on CCR kiss rebreathers I don’t see them adding any oxygen or anything the whole dive when they are cave diving. Is it that slick u can’t even tell.
Once you get it dialed in to your metabolic rate, the O2 levels just don't fluctuate that much.
Great video
Thanks!