This ascent was somewhat unusual for a sub-8000m peak in using bottled oxygen.

He climbs mountains the old-fashioned way, without the help of the bottled oxygen.

The 1996 disaster also introduced the issue of the guide's role in using bottled oxygen.

This expedition had taken bottled oxygen with them, but it was never used.

As a consequence of this scientific work, the 1922 expedition planned to use bottled oxygen.

Rob promised that "bottled oxygen will slow the decline and help you sleep."

Football players and other professional athletes have been known to use bottled oxygen for years as a pick-me-up.

The first and second attempts were done without bottled oxygen.

When supply ships come up, as the frequently do, they bring bottled oxygen that is then released into the station.

Field O lists people who have climbed all 14 without bottled oxygen.