Dont hold your breath

[ruffy]

Why do so many sad accidents happen when bolting for the surface when its in your basic training to breath out on the way up! poor training or bad practice through panic!

[Mark Chase]

Originally Posted by ruffy

Is it possible to hold your breath (if god forbid you had to make a quick bolt for the surface) with your reg in, we all know that you should not, but if you have your reg in will expanding gas automatically vent thru your reg? so if your reg is in your mouth is it fair to assume that no over pressure lung injury should be possible.

If you hold your breath and go up your lungs will burst. They are very very fragile. You can hold your breath with your mouth wide open so the reg makes no difference. If your talking about an unconscious diver the tonge can block the throat which is why you pull their head back.

ATB

Mark

[Richard Mason]

Originally Posted by ruffy

Is it possible to hold your breath (if god forbid you had to make a quick bolt for the surface) with your reg in, we all know that you should not, but if you have your reg in will expanding gas automatically vent thru your reg? so if your reg is in your mouth is it fair to assume that no over pressure lung injury should be possible.

Not having a go here, but don't they teach you that on your course, at the same time they teach CESA/Free Ascent?

[sccs]

As Richard says this is basic 101 teaching, and tbh it’s in the wrong forum any way.

Although I had a similar discussion with my dad and my bro a week or so ago.

Similar questions were discussed along with the possibility of "forcing" a breath holding diver to release the expanding air prior to injury.

As I once overheard an instructor telling a rescue course that he had to punch a guy in the stomach to stop him holding his breath on an uncontrolled ascent.

I guess the answer is simple if you hold your breath and ascend then the air will just expand, and we know that outcome.

One question I did come across was would an unconscious divers lungs automatically vent expanding air during an ascent, afaik they would providing a clear airway was also present?

[dry suit diver]

Originally Posted by sccs

As Richard says this is basic 101 teaching, and tbh it’s in the wrong forum any way.

Although I had a similar discussion with my dad and my bro a week or so ago.

Similar questions were discussed along with the possibility of "forcing" a breath holding diver to release the expanding air prior to injury.

As I once overheard an instructor telling a rescue course that he had to punch a guy in the stomach to stop him holding his breath on an uncontrolled ascent.

I guess the answer is simple if you hold your breath and ascend then the air will just expand, and we know that outcome.

One question I did come across was would an unconscious divers lungs automatically vent expanding air during an ascent, afaik they would providing a clear airway was also present?

ask any submariner what happens to them when they do the free ascent training at the SETT and they don't blow bubbles.

they get a whack in the nackers from the instructors that makes you not hold your breath.

Chasey is rigt about making sure the tongue doesn't block the airway in an unconsciuos diver

[nigelH]

You can hold your breath against a pressure that can tear your lungs to shreds.

Nothing in our nature can over pressure our lungs so we have no built in defence against it. Even if you hold your breath and blow your eyes may bulge but the lungs are still hanging relaxed at ambient inside your now slightly pressurised chest cavity.

Because we go diving and read numbers like 230bar on our SPGs we tend to take pressure with less seriousness than we should. One bar is masses. Think in the old units of 14.5lbs per square inch. About seven kilos (three or four weight belt lumps of lead) on a Christmas postage stamp.

[purple vonny]

If this question was coming from a newly qualified diver, I would be shocked. It is very basic diving physics taught at entry level.

Your previous posts say that you dive a twin set and wing, use an Apeks ("Apex"?) Tec3 that you got half price, and dive underweighted.

I'm a little worried about your safety.

[RogerViking]

Originally Posted by purple vonny

If this question was coming from a newly qualified diver, I would be shocked. It is very basic diving physics taught at entry level.

Your previous posts say that you dive a twin set and wing, use an Apeks ("Apex"?) Tec3 that you got half price, and dive underweighted.

I'm a little worried about your safety.

me too.what vonny and others have said ..have you done the rescue course?

[Scuttler]

I'm struggling to understand the relevance of the question!

As you ascend the gas in your lungs would expand; by breathing slowly out during the ascent you're effectively purging the excess gas from your lungs but still maintaining a full lung or half full or whatever percentage you had when you started the ascent. Unless you're doing this ascent from considerable depth in which case other factors come into play you should in theory never need to hold your breath as there is sufficient gas in your system for you to perform a CESA!

[Scu-bamboo]

Originally Posted by ruffy

Is it possible to hold your breath (if god forbid you had to make a quick bolt for the surface) with your reg in, we all know that you should not, but if you have your reg in will expanding gas automatically vent thru your reg? so if your reg is in your mouth is it fair to assume that no over pressure lung injury should be possible.

if you're holding your breath, the fact that your reg is in would not make a difference would it? As you will still be 'closing' your airways....
correct me if im wrong though....