My normoxic instructor course final dive was a full bailout from 60m. Still ended up with half an AL80 of 18/45 left afterwards, joys of a shallow GF. Opening that tank to empty for the next fill was ...heartbreaking, though not that expensive all things considered. If it was 10/80 or such I suspect I'd have found a booster PDQ.Does anyone do bailout ascent practice then, or just simulate shallower with cheaper gas?