How to do a Controlled Emergency Swimming Ascent: CESA

[@thefiremountainschoolofchi8771]

Great video. Thank you. Love the blooper reel at the end.

[@WaterlineShorts]

Thanks. Glad you enjoyed it

[@zencat999]

nicely done.

[@BruceThee]

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?

[@WaterlineShorts]

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.

[@philipjelley4777]

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?:-/

[@justiny2251]

i hope i don't run out of air

[@andymontes3980]

Did you run out of air?