First dive at 40 meters - Newbies recreational

[Storker]

Once again, this is wrong. If you read all the medical litterature on the subject, there is a relative consensus that everybody is affected at 60/ 70.

Your experience is showing

 

[Dody]

There is no "diving world champion". Scuba diving is not a competition. Understanding this is the best thing you can do for your longevity.



No. Both are not possible. Your computer did not "accelerate", and suggesting that this is a possibility is a huge concern. The two minutes elapsed without you realizing it for one simple reason. See the next response below.



Definitely. See the response above.



It doesn't seem that you have learned any lesson, considering how defensive you are being toward some of the feedback on this thread from people that really want to help you. We are all hoping that you do eventually learn, however, and are able to continue diving safely for years to come.

I am defensive when people mistake their opinion or experience for facts or even worse science. I never refuse a good advice and certainly not science.

 

[Dody]

Your experience is showing

This is not experience. This is reading scientific material and you can’t learn with diving experience.

 

[Storker]

I believe you have a wrong impression of the scientific literature.

I'm a diver, and I'm a scientist. Are you a scientist? Are you trained in how to read scientific literature? If you are, please provide cites.

This is not experience.

I can agree about that.

 

[EFX]

I really dislike the rule of thirds. For open water diving, it's seldom a good rule. It's either too conservative (in the shallows) or too liberal (at depth).

Do a proper min gas calculation and compare the output to the rule of thirds. The former depend heavily on depth, the latter not at all. Which makes no sense, since depth is one of the only two factors determining what your reserve should be.

Would you elaborate on the bolded sentence above in your quote.

 

[Dody]

[QUOTE Both are not possible. Your computer did not "accelerate", and suggesting that this is a possibility is a huge concern.
[/QUOTE]
Ok. I did not want to do it but you deserve it. Do you only know how a computer works? Diving computers have algorithms which stated simply are formulas. A change on one factor can change the result. That’s why as you probably experienced, your deco time can change even if you ascend at the same speed. You can be in deco at one moment and then at NDL 0 moments after.
Huge concern? Read yourself. I value your input in diving not in science or information technology. It is possible that you have a NDL when arriving at a certain depth and that this NDL moves because you moved a couple of meters up or down. I would even say that is not possible. It is certain or there is a problem with the algo.

 

[Dody]

I believe you have a wrong impression of the scientific literature.

I'm a diver, and I'm a scientist. Are you a scientist? Are you trained in how to read scientific literature? If you are, please provide cites.


I can agree about that.

I was talking about your diving experience.

 

[David Novo]

Once again, this is wrong. If you read all the medical litterature on the subject, there is a relative consensus that everybody is affected at 60/ 70. Not 30 or 40 while some can be affected as shallow as 20 meters.

I have taken most of the comments of this thread into consideration. However, I totally disagree with your latest post. Fun does not mean stupid and brainless. And all my choices and decisions result from thinking not impulse. If you believe that you can’t do a risky activity without enjoying it and without having fun, then we just don’t see life through the same eyes. When I was driving at over 300 km/h on a track, it was very risky but I can tell you that all the pilots had fun. And those who died are not the one who the more fun in the track. Really, I find it ridiculous.

"there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns—the ones we don't know we don't know."

 

[Dody]

I believe you have a wrong impression of the scientific literature.

I'm a diver, and I'm a scientist. Are you a scientist? Are you trained in how to read scientific literature? If you are, please provide cites.


I can agree about that.

This one for example. But you should read the full study not the summary. There are many more if this too old.
Memory and metacognition in dangerous situations: investigating cognitive impairment from gas narcosis in undersea divers
Malcolm Hobbs et al. Hum Factors. 2014 Jun.

 

[David Novo]

This one for example. But you should read the full study not the summary. There are many more if this too old.
Memory and metacognition in dangerous situations: investigating cognitive impairment from gas narcosis in undersea divers
Malcolm Hobbs et al. Hum Factors. 2014 Jun.

You did understand that your OP showed that you were affected by narcosis, right?