What to do if . . .

[Thalassamania]

Asked and answered. This is the traditional after-answer free-for-all.

 

[Thalassamania]

They would not want the liability for trying to stop me.

 

[TheRedHead]

You don't need the card so much as the knowledge. A good argument could be made that knowledge may be dangerous without self-discipline and training. Look what happened to Darth.

 

[H2Andy]

Hey ... if you don't have the card you can't possibly walk the walk.

T, i don't think you could walk the walk even with the card

:10:

(oh i'm sorry... so mean... so sorry =)

 

[Thalassamania]

You betchum Red Rider.

 

[Thalassamania]

You mean the second immaculate conception?

 

[MikeFerrara]

Oh my goodness, I don't have a computer! Now what?

 

[Thalassamania]

Bend over, put your head between your legs and kiss your gas goodby!

 

[all4scuba05]

its ok, you won'y know that you're in over your head while you're down there

 

[ChrisA]

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

They say that does not work. There is a good reason it does not work but I don't 100% understand it. The short answer is to think about "tisue compartments" and "nitrogen gradients". Or maybe the real-short answer is that humans are not sodaa botles. If you go up then go down again you will have gas moving in two directions.

I think it would work if humans were just a bag of liquid with no other tissue types but we arn't soda bottles. Once the gas has come out of solution in some slow tissue I think it has harder to re-disolve it and going back to 15 feet is ineffective. Some other effects like the nitrogen in a bone has to first get into the blood and then be exchanged through the lungs. If you go back down the fast tissues will be taking in even more nitrogen because to went from a .78 PP nitrogen environment (the boat) to a higher PP nitrogen environment (air at 15 feet) Breathing O2 at the surface is the way to go

So once yo have a gas micro-buble in some tissue that has poor blood flow going back to 15 feet for a few minutes will only load the blod back up with more nitrogen reducing the nitrogen gradient that the bubbkle sees.

The standard advice is to breath O2 on the surface.