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>The air breaks are to prevent pulmonary O2 toxicity, not CNS O2 toxicity.
>Pure O2 can be nasty over time, even at 1 ATA.

Hello Jeff

I did not consider air breaks to be needed due to the  very small o2
exposure.  Recall that we were doing average 5  air dives in the 40' to 85'
range with 5 minute air decos over five day periods with 2 day layoffs on
the weekends.  The surface o2 for 45 minutes between dives was followed by
approximately 15 minutes of air time while gearing in and entering the
water.  A single 45 minute 1 ata o2 exposure only yields 45 otu's.  The
total oxygen exposure from  4 such 45 minute o2 surface interals plus the
air diving would still be far below Hamilton's recommended maximum of 460
otu's for a 5 day diving schedule.

As far as air breaks not being usefull in preventing cns toxicity I believe
you will find you are mistaken.   
>

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