>> Here in Australia there are instructors who dive one cylinder
>> of mix and one cylinder of air while they have students in
>> the water, and advise their students to dive the same way in
>> the name of economy. No amount of polite reason is going to


I've seen it in the UK too.  In fact, this very same instructor no longer
dives with a long hose.  The reason?  Well, in the past he hasn't needed it
so he doesn't bring it anymore.  During one dive last year, his buddy had a
complete back gas failure and this guy was unable to help as he had
independents with trimix and travel gas.  The buddy had to switch to travel
gas and make a fast ascent to a safe depth.  And this incident taught
him..........absolutely nothing!

John.

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