RSL
Contributor
By a blow gun attachment for the LP hose.... Take some ballons down deep with you, inflate them, tie them, let them go, wait for the pop....... then tell your students see what will happen to your lungs if you hold your breath!
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I think that's beyond PADI ... I have other suspects.i'm still new, but i consider myself to be pretty intuitive. the textbooks he referred reek of PADI speak.
Obviously if you are diving with a dry suit then you have a low pressure feed to add to the dry suit (I haven't taken that course yet so I'm not even familiar with the look of the kit )