What to do if . . .

[dumpsterDiver]

don't forget the exposure on the dive itself?

 

[H2Andy]

let's try that again

you were probably at 1.4 for the dive, which has a max
one-time exposure of 150 minutes (let's assume you were at 1.4 for
the entire dive)

so... for a 45 minute 1.6 hang, i think you'd be ok if your dive was
less than 105 minutes

b/c you don't exceed the daily amount at 1.6 (150 minutes) and you don't
exceed the single exposure to 1.6 (45 minutes) even taking into
account the time you spent at 1.4 (105 minutes)

(same numbers, wrong explanation before)

 

[dumpsterDiver]

?

 

[beezwax]

This is the best thread I've read since the ankle weights debacle! This is the original post....

While preparing for another summer of diving, I was looking through my PADI OW manual and noticed that in a section on required stops, that if you exceed your maximum by 8 minutes on a no decomp dive, you need a stop of 15 minutes at 15 feet. My question is if your air supply will not allow a 15 minute stop, but you have a spare tank on the boat, should you surface, re-tank, and return to 15 feet? And if so, for how long?

Thanks.

Stan

So Stan, what PADI says about their emergency deco procedures is very clear.
1) if your No-D limit is exceeded by 5 mins or less, ascend to 15 feet and do an 8 min stop. And no repeat dive for at least 6 hours.
2) if your No-D limit is exceeded by more than 5 min, ascend to 15 feet and do a stop for 15 mins or more air supply permitting. Then no repeat dive for 24 hours.

If your air runs out before 15 mins, you're done. PADI is not going to tell you to get more air and go back and finish. Should you? I'm sure the last 12 pages have made that answer abundantly obvious.

 

[TheRedHead]

beezwax, PADI doesn't have a procedure for an omitted deco stop.

 

[TheRedHead]

generally, acceptable deco practice is to get back in the water quickly and
follow the deco protocol as planned, but mutliply times by 1.5 or 2.0

I looked this up in the TDI manual:

The most common course of action for short time misses will be to put the diver on oxygen and monitor their condition. Further diving should be curtailed by the diver for 24 to 48 hours minimum.

If the diver and the conditions allow, the US Navy has an alternative emergency technique.

If the diver ascends from 20 FSW or shallower, feels well and can return to the water in 1 minute, descend to the required stop depth and continue with the planned deco. The minute is added to the stop time.

If the diver ascends from 20 FSW or shallower and is not able to return to the water in 1 minute, but remains free of symptoms, the diver can return to the stop and multiply the stop by 1.5

If the diver ascends from a stop deeper than 20 FSW and is free of symptoms, a stand-by diver is available and the water conditons permit:

Return the diver to the dpeth of the first stop
Follow the schedule for any stops 40 FSW or greater
Use 1 minute between stops, not 20 seconds
Multiply the 30, 20 and 10 FSW stops by 1.5

In any case, continuing or placing the diver on oxygen at the surface for at least 30 minutes is a good measure.

TDI gives you a choice of breathing oxygen at the surface or descending again to complete the stop plus breathing oxygen at the surface. If you descend again, it is assumed you breathe the gas planned for the stop you omitted, which would probably be air in the case of this diver.

Isn't it all clear now?

 

[all4scuba05]

it will never be clear for everyone. Some folks believe what they want to believe. Sometimes they are right, and sometimes they are wrong. Its ok for us all to have different opinions/beliefs. When a diver comes here and says he blew a deco dive, sucks O2 onboard and ended up in the chamber....and when his buddy comes here as well, and states that he decided to descend again and went home feeling peachy....well, that will be interesting. Scientifically it doesn't prove either case but sure would be intersting. I can't believe there aren't a few divers here telling us about THEIR OWN experiences descending again.

 

[Wijbrandus]

Serambin, thanks for clarifying your original post. I freely admit I have no experience in the kind of diving you are talking about, and withdraw any opinions I've offered. I wish you would have put that additional info in your original post, so that I would not have assumed we were talking about a normal recreational dive scenario.

I guess the next question is would DAN cover you if you exceed your training by attempting something outside the scope of your training just because you were told to do so by someone on the Internet? This assumes you have no other training than what you have posted in your profile.

If all you have is a PADI OW certification, and you directly violate what PADI says to do in this situation, are you negating your insurance coverage for this incident if you do end up with a problem?

I don't know the answer to those questions. Considering what you are have in mind, you might want to check into it.

 

[ntt]

^haha, i love it!

but,
go by the book. its all already been said, cant get any better advice then that!
and, watch your gauges more carfully, please! plan your dive, dive your plan!

Stay safe!

 

[Thalassamania]

The problem is that folks that have it together enough to have actually thought it out, come up with a plan, and practiced are not the folks who’d have such a problems in the first place. But I find it had to believe that anyone in their right mind would trust the marketers of the agencies before they'd undertake the protocols that the Navy uses to look after their own.