hedgehog762
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oops
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Deep diving on 21%
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It's been done for many decades and continues to be done today. Would trimix be better? Sure. Can divers still dive deep air reasonable safely. Yes.
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hedgehog762
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again this is a requirement of the class and I am wondering what I might expect, was not looking for opinions, I realize it is not a good idea.
If you're doing your AN/DP with TDI, add the Helitrox option so you'll have a clearer head on the deeper dives. I personally would not dive to 160' on air, especially not in a class with new skills and procedures to master.
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hedgehog762
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I will inquire about that, thank you !
Kevrumbo
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Try not to over exert yourself physically resulting in exhaustion/heavy or rapid breathing. Because of the increased density & work-of-breathing on Deep Air, you will be more susceptible to CO2 Retention and Narcosis, potentially leading to Hypercapnia. The only way to recover from this is to relax, cease & desist the physical activity, and try to regain a normal breathing rate --or else abort the dive.
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Stoo
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160' on air is a typical dive in many parts of the Great Lakes... some of the most popular sites in Tobermory are close to, or exceed that depth and dozens of people dive there every weekend on air.
I am surprised that it's part of a course though...
As for what to expect... well, who knows. Somewhere between nothing and narc'd out of your face. Are you doing progressively deeper dives working up to this? If not, I'd say it's potentially foolhardy. In my experience, many, many even most, people can function nicely at that depth, but I also know that some can't. I also know that I don't "like" that depth on air every once in a while...
And to add to what Kevrumbo pointed out, there are very real risks associated with diving to that depth. You will want a top-end reg, well tuned properly. And as mentioned, avoid exertion of any kind...
I am surprised that it's part of a course though...
As for what to expect... well, who knows. Somewhere between nothing and narc'd out of your face. Are you doing progressively deeper dives working up to this? If not, I'd say it's potentially foolhardy. In my experience, many, many even most, people can function nicely at that depth, but I also know that some can't. I also know that I don't "like" that depth on air every once in a while...
And to add to what Kevrumbo pointed out, there are very real risks associated with diving to that depth. You will want a top-end reg, well tuned properly. And as mentioned, avoid exertion of any kind...
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hedgehog762
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thanks kev, this is the type of response I was looking for. My plan was to concentrate as best I can and try to not over exert myself, breath calmly and try to stay as relaxed as possible.
I assume that this is the final qualifying dive for your TDI AN/DP course.
In PADI, this is the Tec 50 course. Air is permitted per standards but I would prefer students to do it on best EAN mix for backgas. Also students should do this and other Tec 50 dives with 2 decompression gases. 50% and 100% preferred. You mentioned only 1 deco gas for your dive?
For PADI Tec 50, Trimix is permitted on the final dive within certain conditions:
1. The Instructor must be a Tec Trimix Instructor.
2. Any Certified Assistants must be certified Trimix divers.
3. The Trimix blend must have 21% O2 or more.
4. Everyone in the team must use the same Trimix and deco gasses.
Check if your Instructor is also a Trimix Instructor. If so, and you're willing to pay for the gas and extras, ask to do it on Trimix. You'll go through a Trimix classroom session, do your planning on Trimix deco schedule, etc.
It'll be a great dive. You'll enjoy and learn. Welcome to the dark side
.
In PADI, this is the Tec 50 course. Air is permitted per standards but I would prefer students to do it on best EAN mix for backgas. Also students should do this and other Tec 50 dives with 2 decompression gases. 50% and 100% preferred. You mentioned only 1 deco gas for your dive?
For PADI Tec 50, Trimix is permitted on the final dive within certain conditions:
1. The Instructor must be a Tec Trimix Instructor.
2. Any Certified Assistants must be certified Trimix divers.
3. The Trimix blend must have 21% O2 or more.
4. Everyone in the team must use the same Trimix and deco gasses.
Check if your Instructor is also a Trimix Instructor. If so, and you're willing to pay for the gas and extras, ask to do it on Trimix. You'll go through a Trimix classroom session, do your planning on Trimix deco schedule, etc.
It'll be a great dive. You'll enjoy and learn. Welcome to the dark side
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