How to do a Controlled Emergency Swimming Ascent: CESA
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- Опубликовано: 19 окт 2024
- CESA: How to do a controlled emergency swimming ascent
waterlineacadem...
When you go diving you have to have a backup plan in case you run out of air. If your buddy is too far away from you, you have to be able to get to the surface. To do that safely you need to know how to do a Controlled Emergency Swimming Ascent: CESA
In this video I show you the steps you need to take to get to the surface safely.
1. Controll your ascent at no faster than 18m/minute by letting some air out of your BCD as you ascend
2. Make sure youdont hold your breath by making an aaaaah sound as youascend
3. Keep your right hand above your head so you can push away any obstacles in your path
4. Keep your regulator in your mouth so you can take a breath of any expanded air and avoid accidentally breathing in any water
5.As you break the surface spit out your regulator and orally inflate your BCD
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Great video. Thank you. Love the blooper reel at the end.
Thanks. Glad you enjoyed it
nicely done.
You mention that you might get another breath as the air in the tank expands. I've been told that because the tank is a rigid container, the air in the container will not expand to provide that extra breath. Comment?
Hey Bruce. Quite right. The small amount of air in your cylinder just becomes easier to breath the shallower you get. You do have the potential to get another breath out but technically it is because the pressure gradient between the inside and outside of the cylinder changes making it easier to extract rather than the air in the cylinder expanding. Well spotted.
Waterline Academy so youre at 6m and you can no longer extract air from your cylinder at an ambient pressure of 1.6 bar. Say youre on a 12l cylinder, the additional air available for an extra breath 1/2 way up (ie at 3m) would be 12x1.3 =4l. So its a viable argument. What is interesting is what landed you in that situation in the 1st place. How the hell did you come to run out of air with a buddy 8m away. A rapid loss of air, say a free flow, would still likely enable you to get to your buddy, who shouldnt be anything like 8 meters (that like 24') away, breath from their aas and still make a safe ascent, from 6m. If its not an equipment failure, which the buddy system is designed to provide redundancy against, then it can only be behavioural, ie you simply ran out of air. If a diver is so poorly trained that they find themselves at depth, on their own and with no air, what are the chances of them remembering this drill?:-/
i hope i don't run out of air
Did you run out of air?