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Deep enough to know for what depths I will choose helium.  Narcosis,
which i hate,  will set in well before oxygen toxicity. There is no
point in my posting numbers.


>What was the deepest dive you've ever done on air?
>Is the floor on air really 185 feet [ppO2 ~ 1.4]?
>
>
>Warm regards,
>
>
>Marv