How to: emergency decompress after a recreational Dive
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- Опубліковано 30 вер 2024
- After a direct questions from one of my patrons: What do you do if you overstay your No Deco time and suddenly run into unplanned decompression.
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Stupid question - why not just look at your computer and do the deco it tells you?
If my computer fails and I have no backup or a buddy who has a computer I'm going to abort the dive. And if my computer fails then I have no way to monitor my depth or my time anyway assuming I don't have a SMB or a backup depth gauge and a watch. A failed computer and unplanned deco during a rec dive is a lot of failures at once.
Personally I think it is so important at basic level for the thinking diver , any diver to understand the philosophy and an implementation of basic deco regardless of qualification..
The world isn't flat but would you believe it or your dive computer told you so . Just a thought
@@bornaluckyman1 I understand the philosophy behind decompression and I agree you shouldn't dive blindly but this philosophy of coming up with a decompression table on the fly is three steps backwards from modern times. Would you do a dive with a planned decompression with a depth gauge, watch and a table or would you do it with a computer. I think the answer would be that you would do it with a computer, and a backup one too, that's why I just don't see any reason to start trying to come up with a decompression plan in your head in the middle of the dive when your computer can do it just as good, if not better.
That's the recreational diver approach and might work as well. Those will probably give you 15 minutes at 3 meters in addition to a 3 minute safety stop at 5. But you might want to think about your deco. I think a minimum deco ascent is better than a straight ascent to 5 meters that's often to fast and then stops. Half your deco can already be done before your computer hits it's first stop.
You should be aware how to do your deco without having to rely on your computer. For instance what sometimes happens is that I forgot to switch my computer to air and it's still on nitrox and see this during my dive. Now what? Could I be in deco? Then what should I do? Or what if you do not have enough gas for the overly conservative deco your computer tells you? Don't completely rely on your equipment but use it as a tool and use your brain.
@@forgot_my_name_again I'm sorry but you're talking about a "recreational diver approach" and then saying that you're suddenly going to come up with a decompression plan after committing a gross negligence of choosing the correct gas in your computer. So now preparing for dives well and checking your gear is "recreational diver approach"? What about technical dives, are you still going to forget to dial in the right mixes into the computer? Are you going to be doing trimix dives with everything noted down, looking at your watch and depth gauge and ignoring your computers because there's a close to none chance that both are going to fail? What if you have an extended bottom time then? Are you still going to calculate the needed deco when it might've increased by 30-40 minutes? I highly doubt that that is going to be the case, no offence intended.
Hi Achim,
The title should read: "How to emergency decompress **during** a recreational Dive".
It seems like there are many arguments that are outside the scope of this video. The example diver is a rec driver like myself, and they are asking for a best practice for the situation since they aren’t certified deco divers. I believe the message that’s being conveyed here is no matter how you do your extra deco it is better to do anything than nothing, and longer shallower deco seems to work better. From what I’ve read in a few articles this seems right, Mark Powell’s hour and a half long video on decompression stated the same thing. Even in open water we are also trained that the highest risk during an ascent is in the last 15-20 feet… the same depth recommended to spend the most time at. I’ve got Deco for Divers in the mail right now, so I’ll have lots to keep myself busy learning. I’m still very intrigued by the ISE theory of creating your own decompression plan on the fly with Ratio deco, but am not sure I’d always trust myself to calculate off a table on the fly potentially in a stressed situation since reading comprehension takes a lot of focus on my part. For myself I could see how that kind of training could be useful for planning and contingencies for the written dive plan.
Huh. That curve you describe is very similar to Fibonacci’s golden ratio. Funny how that turns up.
good article.
Hello and thx for all your content !
Question on another topic.
Isn’t there a risk of « body injury » when inflating an smb orally ?
It’s not recommended after a dive but what about doing it in the dive and specially on the ascent ?
I got a small, laminated bühlmann table in my wetnotes.
This reminded me of a video on another dive channel where the host, is a very experienced diver, claims he got the bends recently, and did nothing wrong to cause it. The point of his video was that you can get bent, even if you do everything correctly.
Is this possible?
Yes, in fact DAN, the organization that specializes in diving medicine, estimates that as much as 95% of DCS hits ("the bends) are undeserved. Decompression is still an incomplete science, despite the progress we've made.
I regularly only do technical cave dives, I taught a recreational deep class 2 rather mundane less than 3 minutes at deepest depths, average depth 40 feet. My students were fine I did a 6 hour chamber ride Navy table 6. I have thousands of recreational and technical dives. I attribute my hit to hydration or lack there of.
Stupid question. Can you redo the video in feet
Yeah that’s a stupid question. 😆
Considering the rest of the world uses metric, time to learn how to convert.
Just multiply everything times 3 :)