| The diving I do on an almost weekly basis is on air and in the 50m range and I have to say the narcosis I encounter on air at these depths is noticeable but manageable (for me anyway). I think the TDI adv EAN/deco prod course is just a little more versatile.
A logical step from here is obviously trimix oc/ccr, I think it might be a little too large a step for some, as well of the cost implications.
What do you pay for a Twin 12l fill of tx28/25 or tx32/15?
Andy
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