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That is an excellent skill addition to deep diving. This implies you have also had the students learn their SAC, which is also gernerally not covered.
Air consumption at depth or how to calculate is not covered at all IIRC in PADI training, it is all about NDL. Had a eyeopening experience early on about watching air supply at depth, just did not have it drilled into me how fast you use it when deep. When new, divers mostly use up air before NDL time. I sure did, especially with a somewhat small steel 72.
This article was derived from the gas management portion of my AOW curriculum ... one of our dives includes taking gas consumption measurements under both "normal" and "stressful" conditions.
... Bob (Grateful Diver)