Another flying after diving Q

[pasley]

So let me understand the plan. 2 dives per day followed by one dive to only 15 feet and then flying within 12 hours of the last dive. First question is why the dive to 15 feet? Why bother? If you dive within 24 hours of your last dive your dive tables will show you as NOT starting off totally clean of residual nitrogen. Now add this to the rather low dose of additional nitrogen and the recompression to 1.5 atmospheres followed 12 hours later by ascent to 7,000 or 8,000 feet elevation (normal cabin pressure for flying in pressurized aircraft). That leaves the real question of why push the question by diving to 15 feet on the last day when you could conform to the general medical standard by sleeping in on the last day and skipping the very shallow dive. Recheck your risk/benefit analysis. Sleep in or increase DCS risk? Hmmm.

 

[Germie]

If you absolutely want to dive, breath 100% oxygen on the shallower part than 6m (or don't go deeper) and/or breathe it on surface for at least 20 minutes (remember CNS will be 100% after 45 minutes at 6m, remember PO2 limits). There are done studies about shortening the time between diving and flying by breathing oxygen. And yes it works. But would you do this? There is still a lot unknown about dcs. Nobody can tell you when you are 100% safe and when not. And I think you will dive air or ean32 and not pure oxygen. A lot depends on your profiles and depths on previous dives too. Would you take extra risks?