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That depends on what you mean by "contol." While most can not stop a buoyant ascent, the speed can be controlled between about 45 fpm and 300 fpm.as a side note there is not really such thing as a controlled bouyant asscent, once you get bouyant and are ascending it is all but impossible to control.
... and if you've learned to hold your breath in complete comfort for two minutes, then you're golden, no?unofficially, and not reccomended however in the been done catagory, you can do a controlled swiming ascent from as deep as 120 feet. (I have personally done it from 60).
the problem as I see it is that if you are doing it when you have to you will not be in the state of mind to do it properly unless you are able to control you thinking in an emergency.
If you are a swimmer then swimming maybe 75 ft underwater on one breath should not be too much of a challenge. and at that depth you actually have about 4 breaths (due to the air being compressed). if you breath out small bubbles you will feel as if you are about to be out of air for a very long time. also remember that most people can hold their breath (on the surface) for about a minute. at 60 ft/m that is plenty to get you to the surface without dying.
And if you have reason to be and are confident in your skills, then you will, "keep your head."in all if you have no deco obligation, you are somewhat fit and a decent swimmer, then you should not have a life threating problem at any recreational depth if you run out of air and you keep your head.
It's not a rate, it is just a matter of keeping the airway open (as Lynne noted).You read my mind!
Something else which is not really taught in class, is the rate at which you have to exhale. PADI says say "ahhhhhh", which makes perfect sense. But there's "ahhh" and then there's AAAHHHH!!!!!" Would you at least feel the building outward pressure in your chest cavity to let you know you're not exhaling quickly enough?
I'm with you. And what is the rate of ascent for submarine escapes with the new buoyant suits. 300 fpm? or is it 600?This conversation is making me do my old-school curmudgeon thing again! First of all, I refuse to call a free ascent CESA (Controlled Emergency Swimming Ascent) — a burdensome acronym that sounds far too ominous (probably intentionally). The recreational training industry has been playing-down the value of free ascents, or blow & go, progressively for the last 40 years.
Free ascents are very simple, as long as you know enough not to blow your lungs out, and slowly work up to them. I practice a free ascent at least once a year from at least 130'. Intellectually I know I can do them after all these years, the important part is not having to think about it. Any trepidation defeats what in my view is the primary purpose and could make a bad situation worse.
It is NOT like holding your breath and swimming the same distance horizontally. It is far easier. You are buoyant, only slightly if you do it right. The gas is expanding and being expelled, so CO2 buildup is far less.
The US Navy’s ascent rate has been 60’/minute for most of my life and there was no such thing as a safety stop. Hundreds of thousands, probably millions, of dives have been made safely during that period. The point is speeding up ascent is highly unlikely to cause decompression problems and preferable to certain drowning. When practicing, make the free ascent at the very beginning of the dive, before you absorb much Nitrogen. Then head back down and enjoy the rest of the dive. The exercise takes a few minutes.
Trained freedivers typically ascend and descent at 1 meter/second, or 200’/minute. That rate might actually get you bent. However the possibility of getting bent is far less of a medical emergency than the certainty of asphyxiation before reaching the surface.
The virtue is knowing deep in your soul that you are not going to die, thus there is no reason to panic.
OK OK, maybe I need less caffeine. Diatribe over.
It should depend on the situation and the maturity and skill of the divers involved. I would not take most adults down 80 feet and into a wreck but I know a few preteens and lots of teens that I'd be happy to have there as buddies.Since no one else has said it- 10 year old son- 80 ft- inside a wreck? Please, correct me if I am wrong, but I thought a junior diver had a max depth of 40 ft. Not to mention, no overhead environments...
Couldn't hear the siren, I had water in my ears.I guess the scuba police were busy investigating another case and missed that infraction.