Boarderguy
Chief Narctopus Wrangler
Does that mentality also include no dives below 100 without helium or doubles only for dives requiring redundant air?Instead of learning CESA, you can learn to dive in a team and plan your gas.
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Does that mentality also include no dives below 100 without helium or doubles only for dives requiring redundant air?Instead of learning CESA, you can learn to dive in a team and plan your gas.
You should learn both.Instead of learning CESA, you can learn to dive in a team and plan your gas.
no, I‘m just surprised that there is so much emphasis on this skill and nothing usually taught significantly on gas management until later levels. Just „be on the boat with 500 psi.“ Seems backwards to me that’s all.Does that mentality also include no dives below 100 without helium or doubles only for dives requiring redundant air?
no, I‘m just surprised that there is so much emphasis on this skill and nothing usually taught significantly on gas management until later levels. Just „be on the boat with 500 psi.“ Seems backwards to me that’s all.
In my wife's OW course in April '22 the CESA was discussed, but never demonstrated at any appreciable depth. Blow bubbles, ascend at normal rate, breathe fresh air once up top. Gas planning and turn pressures were talked about and executed during check dives. Gas management has almost nothing to do with a cesa unless you don't follow your plan...no, I‘m just surprised that there is so much emphasis on this skill and nothing usually taught significantly on gas management until later levels. Just „be on the boat with 500 psi.“ Seems backwards to me that’s all.
Others on here will question what I am going to say next. If I was in a no alternate air source situation I would ascend breathing a little using my inflator hose as a counterlung.
Yup, there's a reason other divers will question it.
(1) Actual counterlungs, as found on rebreathers, are disinfected with steramine at the end of every diving day, whereas most BCs are not; so either (a) the rebreather community is wasting tons of steramine every day, or more likely (b) any random diver's wing may have bacteria growing inside that are not present in actual counterlungs.
(2) Why is this CESA + additional task-loading believed to be safer than a standard CESA (especially given that in deeper CESA the diver feels less starved for air than one would think, due to gas expansion)? Is there just a small chance that while breathing from your inflator in a flustered state, you forget to keep an eye on your ascent rate?
(3) If you are using the wing as a "counterlung" implying exhaling into it, then after a certain number of breaths the mix inside will become hypoxic. Actual rebreathers monitor ppO2, which this "counterlung" doesn't.
So you think that the hypoxic mixture in the BC bladder it more problematic than the hypoxic mixture in the lungs? Not sure I understand the logic of this statement.
Yup, there's a reason other divers will question it.
(1) Actual counterlungs, as found on rebreathers, are disinfected with steramine at the end of every diving day, whereas most BCs are not; so either (a) the rebreather community is wasting tons of steramine every day, or more likely (b) any random diver's wing may have bacteria growing inside that are not present in actual counterlungs.
(2) Why is this CESA + additional task-loading believed to be safer than a standard CESA (especially given that in deeper CESA the diver feels less starved for air than one would think, due to gas expansion)? Is there just a small chance that while breathing from your inflator in a flustered state, you forget to keep an eye on your ascent rate?
(3) If you are using the wing as a "counterlung" implying exhaling into it, then after a certain number of breaths the mix inside will become hypoxic. Actual rebreathers monitor ppO2, which this "counterlung" doesn't.