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Flicking through this month's National Geographic there was an article on
Mallory & Irvine's ill-fated expedition to Everest, and an old photograph
of them wearing double O2 bottles on their backs.

I've climbed a lot in the past but with limited altitude experience, but I
was wondering if any climbers had ever experimented with rebreathers for
alititude. Altitude sickness has killed or injured an awful lot of people
and O2 supplies severely limits what a team can do above 20000ft. With
today's technology, surely a lightweight rebreather could be a reality? How
long would a rebreather extend a small O2 bottle in this situation.

Often wondered this but never thought of asking until I saw that
photograph. Has this been thought of before?

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