Tech Mania

[Sergio Longhi]

Oxygen is NOT known to be less narcotic than nitrogen.

Who said so?

Lipid solubility would suggest it should be more narcotic,but as it gets metabolized in the body it may be less narcotic. Bottom line is nobody really knows for sure. I think you are deluding yourself if you think you can reduce narcosis at ~40m by upping the O2 slightly.

I would strongly argue that diving a pO2 above 1.4 makes you less safe. In practice it should be fine for a short duration but why risk it?

Recent studies show that gas narcosis are not related to lipid, but (may be) to protein and membrane variation on SNC cells.

I also know (shown by studies) about reduced time exposure, this is why I choose so, I think that possible narcosis is way more dangerous than 5 secs at >1.4 ppo.



Any way, we are opening a can of worms
As I already said, I know it's wrong, this is why I want to go Tech and use different approach as well as different gear.

 

[mathauck0814]

I think the point that's being made is that you haven't spent enough time in far shallower depths. All of the book knowledge in the world goes out the window when you experience your first real failure or have to sort out a buddy's panic attack. You seem to have done a lot of reading and a lot of thinking - now go out there and do a lot of practicing (at recreational depths). If you're a fan of a cave/hog/tech setup, there's no reason you can't dive that at 20m and get your wits about you for a few years. In fact, familiarity in that kit will only help when you are finally ready to move on. You're definitely rushing things.

 

[Sergio Longhi]

I think the point that's being made is that you haven't spent enough time in far shallower depths. All of the book knowledge in the world goes out the window when you experience your first real failure or have to sort out a buddy's panic attack. You seem to have done a lot of reading and a lot of thinking - now go out there and do a lot of practicing (at recreational depths). If you're a fan of a cave/hog/tech setup, there's no reason you can't dive that at 20m and get your wits about you for a few years. In fact, familiarity in that kit will only help when you are finally ready to move on. You're definitely rushing things.

Thank you Math, I said myself that I rushed things.
I said also I don't even barely think to do something my instructors tell me not to do, I just ask to start have knowledge and practice on tech setup. My instructor will tell me where I should go and where I shouldn't.
Meanwhile I'll try to build as much practice as possible in every way.

 

[Dive Bug Bit Me]

Who said so?
Recent studies show that gas narcosis are not related to lipid, but (may be) to protein and membrane variation on SNC cells.

I would be keen to see that study if you can post it as I am always curious to learn more. I think the point that was being made is that the Meyer-Overton Rule gives a good approximation of the relative levels of narcosis at different pressures for different gasses. (I agree with you that it doesn't really explain why it happens). It indicates that Oxygen would be more narcotic, but given that we use it for metabolizing no one really knows.

With regard going into tech at this stage, it seems to be a big concern on SB that you are rushing it. Therefore, I would agree with what TS&M suggested. Start with GUE-Fundamentals. Once you have passed that (with a tech rating), you will have silenced a number of the critics and will find that people are more supportive of moving into tech. Given your low number of dives, consider a primer course before you spend the money on GUE-F.

 

[Sergio Longhi]

Recent neurochemical basis of inert gas narcosis a... [Undersea Hyperb Med. 2006 May-Jun] - PubMed result

 

[Sergio Longhi]

With regard going into tech at this stage, it seems to be a big concern on SB that you are rushing it. Therefore, I would agree with what TS&M suggested. Start with GUE-Fundamentals. Once you have passed that (with a tech rating), you will have silenced a number of the critics and will find that people are more supportive of moving into tech. Given your low number of dives, consider a primer course before you spend the money on GUE-F.

I had a look to the GUE F, nice stuff, seems really well done, I will see what I can do with the guys from Trieste.
A lot of that things I know I can do it for sure, believe me, I'm new to this, but's it's a long time I'm in the water and recently I've seen people with hundreds of dives doing such a mess underwater, buoyancy control awful, propulsion techniques garbage, silt everywhere, little ocd and psycosys before enter the water, decompression in all kind of position going up and down like balloons and so on. I'm not saying that I'm perfect, I'm well aware that I've no experience and I'm only at the beginning, I know, but instructors that dive with me always think I have way more dives than I have.

Let's start the show off (irony mode on), on my wife side, someone kick her in the mouth for a mistake and broke the rubber mouth piece, at 40 meters, she look at him kind of pissed then pulled out her octopus like normal.
On my side, apart of normal skills I can follow my daughter doing discovery diving withOUT scuba gear up to 10-15 meters deep, stay there for a little while, then come back to surface. Another instructor just to test me ask me for the my mask that it wasn't clean at 30 meters, I give it to him and he kept it for a while pretending to clean it with some algies , no panic, I was smiling.

Anyway, jokes apart, I don't want to have a course just to "silence critics", I want to do it to acquire more knowledge, skills and to be able to do what I like to do with more safety.

 

[Simon-]

I am curious.

In many of your posts, you mention instructors being with you, guiding you, advising you etc.

How many dives have you actually done independant of an instructor?

Your profile states 25-49 dives.

OW - 4 Dives
AOW - 5 dives
Deep - 4 dives (maybe 3 if the instructor gave credit for the deep dive in AOW)
EANx - 2 dives if the optional dives were done

That is 15 dives. Doesn't leave a lot of dives to have gained too much experience in preparation for tec.

Don't rush things.

You haven't said which agency you would be doing the training with for tec. Are you sure you meet the prerequisites? With what your certification levels are, you just barely (that is depending on the actual profile of the dives you have done) meet Tec 40 requirements (assuming you would be staying with PADI).

This isn't trying to put you down, just to make sure that you are not rushing blindly into a whole new style/mindset of diving

 

[DevonDiver]

I agree with Simon's concerns.

As a rule of thumb, you need to be a great​ recreational diver, before you can be a floundering, useless newbie tech diving trainee...

 

[Pullmyfinger]

Sergio,

You're gonna do what your gonna do.................I agree that you should have more recreational dives under your belt first.
Learn and have plenty of experience planning and executing a dive plan (gas planning, actually staying at your planned depth, etc.)

Have a real good handle on bouyancy control.

Just go dive, in a variety of conditions. Then pursue technical training.

Take care,

Mitch

 

[Sergio Longhi]

It looks like no metter what I'm rushing in..... LOL
Ok, got it