Decompression on record dive?

[wings]

Allen Sherrod seeks to break world record | wtsp.com

This guy has since had to end his dive (planned 72hrs at 15') due to rough seas, but he did a 120hrs (I'm assuming at 15') before.

Does anyone know what sort of decompression we're looking at here?

Apologies if this isn't the right subforum I should be posting to.

 

[Druid]

Decoplanner gives 1 min @ 15ft, 1 min @5ft for the 120 hour dive

That's using 21%

 

[manni-yunk]

Decoplanner gives 1 min @ 15ft, 1 min @5ft for the 120 hour dive

That's using 21%

How does a one minute stop at 15' help off gass from a dive that was, in its entirety.......at 15'??

 

[Mr Carcharodon]

Without looking anything up I'll go out on a limb and say that the. ceiling for a 15 foot dive is significantly above sealevel. See Erik Bakers paper "Understanding M Values"

 

[Thalassamania]

If you are not below 23 FSW you may ascend to the surface at 30 fpm even if you are saturated.

 

[DiveNav]

If you are not below 23 FSW you may ascend to the surface at 30 fpm even if you are saturated.

How did you get 23fsw?
Assuming that the leading compartment is 16, I get ~20fsw....

 

[Thalassamania]

That's where we put the moon pool for Jules' Undersea Hotel and the entry trunk for Marinelab, based on expert advice and calculations.

 

[DiveNav]

That's where we put the moon pool for Jules' Undersea Hotel and Marinelab, based on expert advice and calculations.

I would be very much interested in seeying the calculations

 

[Thalassamania]

Can't help you there, that was long ago. I suspect that any difference is in that the old USN m-values were used.

 

[Rhone Man]

If I were him, to be on the safe side, I would breathe a tank of pure O2 for the last half hour or so. I am sure that is almost certainly not necessary, but given the overall logistics might be a sensible precaution.