The pure oxygen coming out of the cylinders would be exceptionally dangerous if it meant you inhaled pure oxygen, but even trauma masks in hospitals can only get up to about 80% inhaled oxygen. The bends, yeah, but it's that or die in a fire, and I don't trust the Authority to have accessible sealed compartments either, I'm taking this to be a sorta 'what is described is pretty much all you can rely on' sorta situation.