Deep South Divers
Contributor
There doesn't appear to me to be anything wrong with your computer. That's the way that algorithm works.
The bottom line is that, according to the computer's math, your body was still ongassing, even at a depth as shallow as 25' or so. The longer you stayed down below that depth, the more "decompression time" your computer added to your dive.
You appear to be surprised at how quickly it added time to your "decompression obligation." Don't be - four long dives in the same day on a high N2 mix (read: air) with too small a surface interval between each dive can and will quickly nail you if you "go into deco."
It appears that, according to the Wisdom's algorithm, not until you hit 25' or less did you pass the "floor" - the point at which your body stopped ongassing and begin to offgas. The reason for the shallow floor was because of a large amount of residual nitrogen - four long dives on air with comparably small surface intervals. Once you went over your NDL, you piled obligation on quickly, and even at comparably shallow depths.
That is to say, that even though you were on ascent around 1:08, it took you four and a half minutes to come up 20' - which was four and a half minutes of continued ongassing... And yes, after four dives, a factor of 8 or 10 can result (because of the residual nitrogen from prior dives), giving you about 45 minutes of decompression obligation at 10'.
So is the problem the computer?
Nope.
Hate to point out the obvious, but regardless of what computer you were using, you'd still have dived the same dive. Kinda like telling the police officer that you were going too fast because of your speedometer.
Would it make sense to consider the purchase of a new speedometer? Perhaps contact the manufacturer of the speedometer and ask what was going on?
I'm not going to "beat you up" either - my point is that if you are considering the purchase of a new computer, you're attempting to apply a solution to the problem that is not a direct solution to the problem. I think you have expressed that you grasp the problem well - what other solutions come to mind?
My suggestion would be to not press on the gas pedal so hard. Perhaps shorter dive times (do you realize that you spent some 7 hours underwater that day?), or longer surface intervals, or shallower dives, or a better gas mix would be a better plan.
For what it's worth, Your 32% idea was a good one - but in-water recomression is a complex issue, best left to those trained to do such a thing. A better idea probably would have been 100% O2 at the surface. If this sounds intriguing, call DAN and ask what their recommendation would have been.
Oh, and tell them that SeaJay said hello.
Edit: Oh, and before I forget... Glad to hear that you're okay. I bet you were TIRED by the end of the night. How long did it take you to feel normal again? Did you ever experience any numbness or tingling? Unexplained rash? Ringing in the ears or nausea? Difficulty focusing mentally or visually?
The bottom line is that, according to the computer's math, your body was still ongassing, even at a depth as shallow as 25' or so. The longer you stayed down below that depth, the more "decompression time" your computer added to your dive.
You appear to be surprised at how quickly it added time to your "decompression obligation." Don't be - four long dives in the same day on a high N2 mix (read: air) with too small a surface interval between each dive can and will quickly nail you if you "go into deco."
It appears that, according to the Wisdom's algorithm, not until you hit 25' or less did you pass the "floor" - the point at which your body stopped ongassing and begin to offgas. The reason for the shallow floor was because of a large amount of residual nitrogen - four long dives on air with comparably small surface intervals. Once you went over your NDL, you piled obligation on quickly, and even at comparably shallow depths.
That is to say, that even though you were on ascent around 1:08, it took you four and a half minutes to come up 20' - which was four and a half minutes of continued ongassing... And yes, after four dives, a factor of 8 or 10 can result (because of the residual nitrogen from prior dives), giving you about 45 minutes of decompression obligation at 10'.
So is the problem the computer?
Nope.
Hate to point out the obvious, but regardless of what computer you were using, you'd still have dived the same dive. Kinda like telling the police officer that you were going too fast because of your speedometer.
Would it make sense to consider the purchase of a new speedometer? Perhaps contact the manufacturer of the speedometer and ask what was going on?
I'm not going to "beat you up" either - my point is that if you are considering the purchase of a new computer, you're attempting to apply a solution to the problem that is not a direct solution to the problem. I think you have expressed that you grasp the problem well - what other solutions come to mind?
My suggestion would be to not press on the gas pedal so hard. Perhaps shorter dive times (do you realize that you spent some 7 hours underwater that day?), or longer surface intervals, or shallower dives, or a better gas mix would be a better plan.
For what it's worth, Your 32% idea was a good one - but in-water recomression is a complex issue, best left to those trained to do such a thing. A better idea probably would have been 100% O2 at the surface. If this sounds intriguing, call DAN and ask what their recommendation would have been.
Oh, and tell them that SeaJay said hello.
Edit: Oh, and before I forget... Glad to hear that you're okay. I bet you were TIRED by the end of the night. How long did it take you to feel normal again? Did you ever experience any numbness or tingling? Unexplained rash? Ringing in the ears or nausea? Difficulty focusing mentally or visually?
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