Ever narked? Never!

[yazzyfooty]

Originally Posted by Buoyant Babe

Sometimes I hear a telephone ringing underwater, even on relatively shallow dives. The bells, the bells!

I also hear different noises under water and several times it has been music, its a bit like sitting on a bus and some chav has his mp3 player a bit too loud and I can hear that tingy ting noise.
Last time Iwas aware of being narked was at the hydrobox at Stoney and I thought i was on a lovely tropical beach and was telling my buddy for us to stay there!

[balbrigganbloke]

Worst case was a difficult surface swim to a down line and a lost inflator hose on the way down to 43m on the U861 and forgot how to turn my torch on. The dive on the bottom lasted 15 mins I can remember at best 3 mins.... Ask Dave... A narcosis like that will put some real manners on you, if it doesn't result in your!!!! Everybody is narked to varying degrees, just be aware of it and the dive is lot more comfortable and enjoyable..... Good question though Graham...

Jonny[/quote]

I remember that hopefully it wont be as bad next month

[James The Badger]

Originally Posted by Brian of Aquanauts

One of my friends is currently running a narcosis study at a chamber, and it's showing some quite interesting results about risk taking. Can't wait to see the paper.

This is amusing AND sobering viewing if you want to see a deep air dry dive!
From my own experience I have guided dives as shallow as 18m and had divers almost non responsive with narcosis and then not been able to remember a thing about it on the surface.
I would also like to know why there is not more discussion about the effects of CO2 and it impact on narcosis at the recreational training level?

[James The Badger]

Originally Posted by Brian of Aquanauts

One of my friends is currently running a narcosis study at a chamber, and it's showing some quite interesting results about risk taking. Can't wait to see the paper.

This is amusing AND sobering viewing if you want to see a deep air dry dive!
From my own experience I have guided dives as shallow as 18m and had divers almost non responsive with narcosis and then not been able to remember a thing about it on the surface.
I would also like to know why there is not more discussion about the effects of CO2 and its impact on narcosis at the recreational training level?

[Mark Chase]

Any one who put they have never suffered narcosis obviously doesn't understand gas laws. If you have been diving then you have suffered narcosis. It is just a matter as to what degree or perhaps to what extent you're clear headed enough to realize your not clear headed

On the more salient issue of at what depth you begin to feel incapacitated? Then there will be a thousand answerers. For me depth is not particularly relevant, it would need to read at what depth under what level of stress.

On an easy relaxed dive I have run independent 12s and shot some great video footage at 65m on air. I can recall all the details of the dive no problem. On a stressful dive I have been badly narked at 30m and in danger of doing something rely stupid on a 60m blue water dive.

There is no specific line in the sand but i prefer to dive an equivalent narcotic depth of not more than 25m on any potentially stressful dive. On an easy clear blue warm water dive Id happily go to 60 on air and draw the line at 70 but I accept the fact if something raises my level of stress I will be hard pushed to deal with it.

ATB

Mark Chase

[Mark Chase]

Originally Posted by James The Badger

This is amusing AND sobering viewing if you want to see a deep air dry dive!
From my own experience I have guided dives as shallow as 18m and had divers almost non responsive with narcosis and then not been able to remember a thing about it on the surface.
I would also like to know why there is not more discussion about the effects of CO2 and its impact on narcosis at the recreational training level?

Co2 is an order of magnitude more narcotic than Nitrogen.

C02 retention is brought on by many things but they can rely be reduced to the big two: poor breathing technique and smoking.

Skip breathing, shallow rapid breathing and increased breathing resistance due to badly set up regulators being the primary culprits.

C02 is retained and has a cumulative affect in the body. It gradually builds up till it hits you. End result is massive narcosis often mistaken for a wave of vertigo or other spinning sensation.

We are always concerned about C02 hits on CCR but in fact i have had never suffered a C02 hit on a CCR but i have had a few on OC.

ATB

Mark Chase

[Craby]

[a Solo, 49 metre dive, with a single 12 litre, on holiday last year,

it was me that was "narked off" went you failled to see me on the way back altho we did laugh about it much later on.

as for bein narked no i dont think i have. very pi$$ed off with my buddy yes altho that never last longer than a second

[James The Badger]

Originally Posted by Mark Chase

Co2 is an order of magnitude more narcotic than Nitrogen.

C02 retention is brought on by many things but they can rely be reduced to the big two: poor breathing technique and smoking.

Skip breathing, shallow rapid breathing and increased breathing resistance due to badly set up regulators being the primary culprits.

C02 is retained and has a cumulative affect in the body. It gradually builds up till it hits you. End result is massive narcosis often mistaken for a wave of vertigo or other spinning sensation.

We are always concerned about C02 hits on CCR but in fact i have had never suffered a C02 hit on a CCR but i have had a few on OC.

ATB

Mark Chase

I am an instructor with good number of dives and certs under my belt, and it really concerned me that until I did my GUE fundies last year I simply did not know that there was a relationship between narcosis and CO2. I accept now that was a hole in my own knowledge, but why is this information not part of recreational diver training where the emphasis is on the relationship between depth and narcosis? Is it just the PADI OWD course that does not discuss this?

[frosty the snowman]

I tend to fall into the 'constantly checking things' type nark category. The only exception is when I dive the wreck of the Hellopes in Mounts bay. Then I become easily spooked. I don't know why this should be. My deepest air dive (HMS Formidable, 69m) didn't have that effect. I certainly heard dogs barking though!

[Mark Chase]

Originally Posted by James The Badger

I am an instructor with good number of dives and certs under my belt, and it really concerned me that until I did my GUE fundies last year I simply did not know that there was a relationship between narcosis and CO2. I accept now that was a hole in my own knowledge, but why is this information not part of recreational diver training where the emphasis is on the relationship between depth and narcosis? Is it just the PADI OWD course that does not discuss this?

PADI OWD is an 18m depth course so its unlikely to go in to great detail but it does discuss narcosis in general terms. PADI deep deals with it more specifically and involves cognitive tests at 30m to demonstrate the effects of narcosis. C02 was discussed on my PADI deep diving course in relation to smoking and breathing resistance on regulators and skip breathing. My instructor Joup was a deep tek diver in his spare time so that may have influenced the issue.

IMHO the effects of retained C02 have been highlighted in the last ten years since the wide spread uptake of CCR in recreational diving. C02 has since been promoted to the No1 threat in my personal list of diving dangers.

ATB

Mark