rapid accent

[scapaman]

just a thought,
but i thought that if you were to go back down to 6 metres all you would be doing is add to the nitrogen in your body. once your up your up and the damage is done , and do the agences say never to go back down?
just a thought .

[nigelH]

Originally Posted by scapaman

just a thought,
but i thought that if you were to go back down to 6 metres all you would be doing is add to the nitrogen in your body. once your up your up and the damage is done , and do the agences say never to go back down?
just a thought .

Most agencies set a time limit as nothing happens quickly. A minute or two.

What you have is a minimum pressure that is considered safe for a given amount of dissolved gas. Decompression tables and computers estimate the gas in your body (which is an agreed formula that virtually all systems use) and the apply their own magic to guess the minimum amount of pressure you can safely ascend to.

You could run the rule that you never let the absolute pressure drop below the tissue 'tension' (equivalent of partial pressure but for dissolved rather than free gases) but this would give hugely long deco periods. The black art is deciding how soon you can come up. At 6m you are not gaining significant nitrogen but the danger with going back down is that if you have generated bubbles and a bad bend you need much deeper than 6m to recompress them enough to get through the narrow blood vessels and back to the lungs to be filtered and if you were to lapse unconscious you drown quite efficiently.

If you overshoot get back down to your stop depth at once. <slap>
If you've been a while get out of the water and breath O2. Not that there is anything magic about O2 other than it contains 0% nitrogen so all the gas transfer is outward.

[Juz]

Originally Posted by scapaman

once your up your up and the damage is done , and do the agences say never to go back down?
just a thought .

It's not as simple as that. The agencies say do not go back down because it's is much easier to treat people safely on a boat rather than in the water.

With a minimal stop missed and following a missed stop protocol, what you're doing is balancing a very very minor risk of having a symptomatic bend against the attempt not to become symptomatic.

Anyway, my earlier post is what I would have done, not necessarily what I would recommend you do.

Juz

[milldog]

Originally Posted by scapaman

just a thought,
but i thought that if you were to go back down to 6 metres all you would be doing is add to the nitrogen in your body. once your up your up and the damage is done , and do the agences say never to go back down?
just a thought .

Its not the loading of nitrogen it's the bubble growth and formation the growth can be as much as 40% in the last 6 meters however this will take a bit of time hence the reason to go back down within 1 or 2 minutes.

and finish the deco adding some extra for the growth (X) factor normally 50% extra however this still wouldn't stop you getting bent and you were right to stop the second dive

personally i would have used up the last of the deco bottle on the boat whilst i chilled out.

Graham

[Dave_S]

Originally Posted by scapaman

cheers for the responce it was a slow decent and it ws not a square profile advarge depth was about 27. but when looking at my tables after the dive it said i could have another five mins at that depth.so maybe the uwatec was over cautious but it still gave me a fright.
and as for my fitness i`m the fitess fat sod you will see. ( joke)

That seems quite a deep average if your max was 32m you must have spent most of the dive at or below 30m to achieve that with a slow descent.

Also you havent said how rapid was rapid - if you polarised out of the water it's one thing

But when i learnt to dive there were no computers so we were told to asscent slower than our bubbles, now however i wear a computer which is punnishingly restrictive in it's ascent rates [not a bad thing]

and the other factor is "and the body you were using came from???" - we all different and our bodies seem to be able to tolerate different levels of punishment withou obvious injury.

the only real answer is what happened on the surface.

Dave

[scapaman]

Originally Posted by Dave_S

That seems quite a deep average if your max was 32m you must have spent most of the dive at or below 30m to achieve that with a slow descent.

Also you havent said how rapid was rapid - if you polarised out of the water it's one thing

But when i learnt to dive there were no computers so we were told to asscent slower than our bubbles, now however i wear a computer which is punnishingly restrictive in it's ascent rates [not a bad thing]

and the other factor is "and the body you were using came from???" - we all different and our bodies seem to be able to tolerate different levels of punishment withou obvious injury.

the only real answer is what happened on the surface.

Dave

i never came out like scud i just came up quick ,how quick god know`s ,quick enough to scare me and i think were all made up different so maybe some one else could have done the same dive and got bent who know.
but untill it happens to you you don`t know how you would react we can all say i`d do this or i would do that but like i said before thanks for all the comments and can anyone tell me why my arms ache and i have a rash all over?........(joking)

[dublinbay]

Bottom line, when in doubt/denial, get your arse to nearest chamber asap. Sod going back down if avoidable. Strap on O2, call emergency services and get sorted. Thats what they are there for.
Apain in the elbow does not mean you you are only manifesting a bend there, bubbles could be forming elsewhere i.e. spinal cord etc. All suspected bends are now treated as suspect CNS hits.

[Paddy Diver]

Originally Posted by dublinbay

Lots of Irishmen have fast accents and never get bent...........

Well at least you have a sense of humor about it, glad to see your back up and running Jack.

PM sent


Ian

[dublinbay]

Originally Posted by Paddy Diver

Well at least you have a sense of humor about it, glad to see your back up and running Jack.

PM sent


Ian

Getting bent out of shape does not harm the funny bone Mind you, you have to have a sense of humour to begin with

[davidcarson]

Good to see you back on the boards Jack. How are things?
The draw went really well for you, I didn't win anything but its the taking part that counts.

Take it easy!