Weird experience today - ox tox warning

[grouchyturtle]

Ok I'd never dive the profile of the original post, BUT...

Why would he reach 100% exposure so quickly?

I'm looking at the table right now and at PPO2 1.6 it would take 45 min to reach 100%. At 139' he was at about 1.7 PPO2.
On the second dive he was at about 1.6.

Oh yeah duh he never did clarify what his bottom times were!!!

 

[pescador775]

Sorry that you find it so disturbing, take a pill.

I strapped on my first SCUBA in 1954 and know a bit about the sport. I was in the Navy and later worked in the Dept of Navy for 20 years. I finished my career managing a T&E group. The Navy has a lot of safety rules which have a tendency to evolve over the course of time. The older rules were written in blood, especially those pertaining to Navy ordnance but the same applies to diving. Like all bureaucratic organizations, including civilian ones like ANDI and the other alphabet soup, these outfits are staffed by people who have to come up with new stuff. This is necessary for their career advancement and for the organization to grow dynamicly. Therefore, after all the obvious stuff has been discovered and implemented the researchers are under pressure to find safety issues at the margins of sanity. These 'refined' rules, published in the appropriate media, probably apply to nobody in good health or fitness or to a miniscule population, say 1 in 1 million. Nevertheless, these rules are adopted for the entire population at large. Sometimes there are slight variations between those approved for civillian applications and military. This is due to the exigencies of shipboard operations, mostly. Knowing how these rules are generated, in perpetuity, there is a 100% probablility that more restrictive dive rules are on the way and the same crowd that inhabits this board will have a new urgent matter about which to raise an alarm. Typically, the beleagured diver will be told he has to purchase more equipment to comply. If that is not feasible a new course will be recommended.

PS, I believe he was instructed to purge the bladder but I'm not sure if he did. When I translated the French into German it is possible that Gunnar heard something else, like 'take a pee'. I was thirteen and he was a mature fourteen. He became an American citizen recently and after residing in the states for 30 years. He explained that after 911 he wasn't taking any chances. Gunnar is one of the most remarkable and talented immigrants that America could wish for. Wish we had more like him.

I find this more disturbing than the original post.

 

[H2Andy]

Ok I'd never dive the profile of the original post, BUT...

Why would he reach 100% exposure so quickly?

I'm looking at the table right now and at PPO2 1.6 it would take 45 min to reach 100%. At 139' he was at about 1.7 PPO2.
On the second dive he was at about 1.6.

Oh yeah duh he never did clarify what his bottom times were!!!

you are confusing two issues here (which i did not too long
ago in public too; don't feel too bad)

there are two things you can not exceed: max PO2 for
a mix AND max time at that PO2 for that mix.

thus, if you exceed 1.6 ata on a gas, even for a short time,
there is the risk (albeit unpredictable and small) that you'll
suffer CNS toxicity.

OR you could stay within 1.6 ata but exceed the max time
at that ata, and then, again, you'll risk CNS toxicity.

hope i stated this clearly

 

[Scubaholic]

I think scubaholics initial post was a troll, and many experienced scubaboarders fell for it.

I assure you, cancun mark, I have far better things to do with my time then sitting around planning how I can get my jollies by trolling on scubaboard. :06: Furthermore, had I intended a troll post, I could have done a far better job than plainly stating two dive profiles and moderate symptomatology.

 

[Mako Mark]

Anybody here want to guess why a diver survived diving to 50 meters (about 165') on an O2 rebreather?.

My guess is that it was an O2 rebreather, but using a tank of air! I cant imagine O2 being that easy to get hold of in postwar greece. ppo2 1.26 which would be perfectly ok, compared to a ppo2 of 6 ata, which is highly improbable.

The highest I have heard of anyone diving is 3.2 ppo2, and that involved a close call.

 

[grouchyturtle]

Ok so basically he probably got the warning (and symptoms) very quickly simply for exceeding MOD on the first dive regardless of time spent at depth and then going to a PPO2 of 1.6 on the second dive?

 

[pipedope]

I strapped on my first SCUBA in 1954 and know a bit about the sport. I was in the Navy and later worked in the Dept of Navy for 20 years. I finished my career managing a T&E group. The Navy has a lot of safety rules which have a tendency to evolve over the course of time. The older rules were written in blood, especially those pertaining to Navy ordnance but the same applies to diving.

The rules were written in blood many years ago as you well know.

Why should anyone want to rewrite them in blood again today?

I don't really care if you want to go out and take major risks and possible kill yourself doing these kind of dives.

I DO care that they are presented in a cavilier manner such that many new divers may think they can do the same thing WITHOUT real risk.

If you want to advocate extream diving and ignoring the limits established by the regulating agencies of our sport you are welcome to do it ON YOUR OWN FORUM.
NOT on ScubaBoard.

The reason the limits are where they is because too many people were dieing with the older, looser limits.

 

[bwerb]

Please don't listen to this self righteous crowd. A dive to 1.6 atm O2 is not a big deal, it is quite conservative. <snip>I, myself, suffered a bends hit due to carelessness. I was treated with 3 atm O2 with no particular effect. It didn't cure me and didn't kill me. I eventually got better and still dive.

So...your explaination of the preliminary symptoms described by the diver would be??? Oh yeah...the start of O2 toxicity...

Hehehe...I love it when someone comes on here talking about the "good old days" and not to worry about the "safety bureaucrats" when they admit that they bent themselves due to carelessness...yup that's the guy I'm going to take advise from on dive safety.

Lastly, 3ATM dry in a chamber is no comparison to the active and working portion of a dive.

 

[pipedope]

I have not heard of any cases of someone drowning in a recompression chamber.

 

[Scubaholic]

I am looking at the dive log in my Suunto Cobra computer. First, it was an error for me to say in the original post that I was diving 32% on the first dive. It was only 30%. My error. I also was wrong saying 45 minutes....it was just under two hours!! The next spot was only six miles away, but the seas were rough and it did take a lot longer than normal. (Note to self, do not post when experiencing a beer buzz).

Here is the information that can be gleaned from the Dive Log:

Dive 1: Starts at 7:23AM
Mix 30 EAN
Max Depth 139fsw
Max OLF 100% (all 10 bars)
Dive time 23 minutes


Dive 2: Starts at 9:20AM.
Mix 32 EAN
Max Depth: 126fsw
Max OLF during dive: 9 bars (not 10, as I had thought). Friggen Suunto needs to make that more readable.
Total Dive Time: 19 minutes (this was not at depth, I ended it upon what I thought was a 100% notice, but what was evidently an alarm telling me I was at 90%)

I am now going to compare this with the Suunto Vytec on my wrist.