Once again your attempt mislead and obfiscate issues.
And once again you freely give "advice" about something you clearly know nothing about. But your mouth keeps moving.
Common practice to supply 100% O2.
Standard parctice on Deco dives to switch to 100% at approprate depth.
First rule of medicail assiastance at surface 100% O2.
Clip to line standard practice. Somtimes better than cable hooch. Waves.
100% O2 almost standard practice given to many divers upon request,.....ICE, HEAT, tired, etc,...