Is this tongue in cheek or are you saying air breaks aren’t necessary
Yes definitely trolling. But is there really any science testing the air break heuristic?
It sounds like something someone just made up to 'fix' their hour+ deco on oxygen.
Like others in the thread, I am lucky enough that superiors inspect the 'always deco @ 1.6' mantra
ppO2 1.6 while demonstrably survivable for long durations seems almost never necessary
Probably better to:
accept ~1.4 on your mix / flush and do that extra 5 minutes
hang at 4.5 metres or 3 metres (10ft) instead of 6 (20) if you plan a long oxygen session--the ppO2 is lower AND the off-gassing gradients are better.
incorporate real 80% or even 50% blocks, if one of your main concerns is eliminating helium. Better CNS management than maximizing time at 1.6 with brief 'air breaks' on whatever other gas is available (trimix? lol)
run a higher GF-high, exit carefully, plan 'surface deco'
use a habitat or surface deco chamber for any deco plan above ~1-2hrs
The funniest part is divers who think their deco efficiency is directly a function of ppO2, which is an incomplete comprehension of decompression theory.
Some of these will start oxygen flushing at 30ft / 9m because "it's easier to hit 1.6" when in reality they will be off-gassing better at 10 ft / 3 metres at a ppO2 of ~1.3