Do you/would you fly with an 19hr surface interval?

[redacted]

Each to their own trickery.

I guess one diver's "trickery" can be be a proven safe practice for most other divers.

 

[scubadada]

Hi,
I finally got around entering into divePAL a plan similar to the one mentioned by the OP: basically I made 12 identical dives over a 3 days period : each dive has a square profile (30ft/90min).

I then analyzed the whole sequence with divePAL in Moderate settings. (for more info on our algorithm read the article Fine Tuning a Decompression Algorithm)

As per image below, at the end of the last dive the Nitrogen Loading is 76% and the Estimated Pressure Group is S.

View attachment 129878​

Also, at the end of the 19 hours of Surface Interval after dive 12, the Nitrogen Loading is 10% but the Estimated Pressure Group shows DESAT. See image below.

View attachment 129880​

This plan is public on divePAL server; just search dive logs for "ediver / dive plan".
To analyze the whole sequence you will need the Tech version.

10% is more than 0%

Alberto (aka eDiver)

Hi Alberto,

So, what are the implications of 10% residual nitrogen loading and ascent to a maximum of 8000 feet? I would imagine this is below the threshold for clinical significance. Any real idea? If I remember correctly, the pressure at 8000 feet is about 0.75 atm, considerably less of a change than ascending from your safety stop.


Best, Craig

 

[Danseur]

I have a buddy that no matter what profile he dives (air, no O2 etc) he won't leave the water till his average depth is equal to 20.5' or less.

If one were concerned, there is a way to calculate M values etc to get a better mathematical rather than anecdotal picture.