Ur right Mike, Argon is "maybe" a good idea but a pain to find middle of nowhere (aka middle of France

) and not breathable if shit happen and if you still have 200m to exit the cave !
In fact having Air for bcd/suit inflation saved the life of one of my mate 4-5 month ago: he exited the cave breathing/sucking his 2 lit air suit inflator via his bcd
Back to deep dives, I dropped argon a long time ago, and I'm survivng with air and
Xerotherm artic 4th Element
DUI 400gr Thinsulate
Typhoon heating jacket
No skin bends (yet

)
Good day
Jerome