Is this nitrogen narcosis?

[tursiops]

Given his apparently lack of experience and choice of forums to post in, I hope the response here try to be helpful to a new guy.

 

[Storker]

To echo the others and to the OP:

I honestly didn't notice that you'd exceeded your NDL. Without proper experience and training, that's a pretty damned bad idea. You have neither the training nor the skills to venture on dives where you can't ascend directly to the surface if SHTF. Your body is already telling you that you messed up. Post-dive fatigue is a pretty certain indicator that you're suffering from asymptomatic DCS; it may well manifest even after fast ascents and/or deep dives within the NDL.

With your dive count, I'll break my general principles and give a clear advice: keep your dives shallow and well within the NDL until you have quite a few more dives in your log, and quite a bit more experience. Remember that you're in an environment which isn't conductive to human life, and while diving is quite safe, it's only safe if you always remember that it can kill you in many different very unpleasant ways if you don't remember just that.

 

[zixzax]

Thanks guys. Thank you for the tender love... Yes I am a newbie and not supposed to exceed the NDL. It's a lesson for me....
I was having a CMAS 2 course for the first dive today. I was intentionally brought to 30m to practice some rescue skills. We were doing a bit of cave when I exceeded NDL, thus not immediate ascent. Maybe I should have told my instructor about my computer warning. It's a Garmin Descent mk1 by the way.
My second dive was a fundive at another diving center. I dont think it should have lasted that long. And the interval of the two dives was short....Maybe I just should have not done that fundive after an intensive training course.
You guys are right. Never under estimate my computer warning. Good experience though and thanks again.

 

[zixzax]

To echo the others and to the OP:

I honestly didn't notice that you'd exceeded your NDL. Without proper experience and training, that's a pretty damned bad idea. You have neither the training nor the skills to venture on dives where you can't ascend directly to the surface if SHTF. Your body is already telling you that you messed up. Post-dive fatigue is a pretty certain indicator that you're suffering from asymptomatic DCS; it may well manifest even after fast ascents and/or deep dives within the NDL.

With your dive count, I'll break my general principles and give a clear advice: keep your dives shallow and well within the NDL until you have quite a few more dives in your log, and quite a bit more experience. Remember that you're in an environment which isn't conductive to human life, and while diving is quite safe, it's only safe if you always remember that it can kill you in many different very unpleasant ways if you don't remember just that.

Yes I agree. Appreciate your advice and I will keep in mind.

 

[zixzax]

Given his apparently lack of experience and choice of forums to post in, I hope the response here try to be helpful to a new guy.

Very helpful indeed. It was a lesson. ..

 

[zixzax]

X2 on posts above. A few more things:

- It’s a good idea to listen to your computer. Without deco training, it’s not a great idea (putting it mildly) to intentionally break your NDL. Monitor your bottom time and ascent rate. On the way up, conduct an adequate safety stop.

- On post dive fatigue...you’re overdoing it, as your computer log and body are telling you. Consider follow-up training, to include AOW and Nitrox.

Diving Nitrox, I have zero post-dive fatigue. Without it, even doing what I was supposed to do, I was extremely tired after dives. With Nitrox and adhering to my dive plan(s), I can do four dives in a day, pack up, and be wide awake for the two hour drive home.

-“Plan your dive and dive your plan.” Don’t set your computer to the most conservative setting if you have no intention of following it. It’s not a useful tool if you don’t use it properly.

Yes. I will consider Nitrox course after my CMAS 2. And I will discuss with my instructor about my computer conservatism setting during my courses. Thanks for advice.

 

[almostDIR]

I was having a CMAS 2 course for the first dive today. I was intentionally brought to 30m to practice some rescue skills. We were doing a bit of cave when I exceeded NDL, thus not immediate ascent.

by "cave" you really mean a cave or cavern type of overhead environment? and you got to deco in that?

if true it sounds like the instructor was breaching major safety standards there.
most of the more experienced guys here would not want to venture to a cave and end up in deco without extensive training and many years of active diving and lots of safety measures
That is in no way a CMAS2 level diving. More like GUE Cave2 level I think

 

[zixzax]

Hi. Yes I need to review my theory to have confused N2 with deco stress.
Thanks for warning. Good to know.

Diving aggressively and doing repetitive deco dives is stressful for your body. Don't kid yourself, even if you were not that active underwater and not working hard and not cold, the decompression stress is there.

If you are feeling excessively tired, then you might take that as a warning to back off a little and come up earlier or come up slower. If you are confusing post-dive fatigue with N2 narcosis, then you might want to back off the aggressive diving and take another more advanced dive course that allows you to review these important topics and would clarify the difference between narcosis and decompression sickness.

 

[zixzax]

by "cave" you really mean a cave or cavern type of overhead environment? and you got to deco in that?

if true it sounds like the instructor was breaching major safety standards there.
most of the more experienced guys here would not want to venture to a cave and end up in deco without extensive training and many years of active diving and lots of safety measures
That is in no way a CMAS2 level diving. More like GUE Cave2 level I think

It was a tiny 'cave' on a cliff. We entered and went up 2-3 meters and reached the end. We stayed about 3-5 minutes in it and retreated. I think it was a little exploration.

 

[Storker]

by "cave" you really mean a cave or cavern type of overhead environment? and you got to deco in that?

Physical overheads like cave/cavern and virtual overheads like deco are two different issues, but very much related. Whether you owe a deco obligation or are below a physical ceiling, you can't ascend directly to the surface if SHTF. That's the fundamental difference between "rec" and "tech" diving.

Get a couple hundred dives under your weight belt, then it's time to consider if you want to "go tech". Or if the investment in training etc is more than you care about.