Hillary mentions that he finds partially used oxygen bottles left behind by another pair of climbers. why does hillary include this information in "the final assault"? the oxygen bottles reveal that the climb up mount everest is so difficult that climbers cannot carry their equipment back down the mountain. the partially used bottles imply that climbers can reach high altitudes without the use of oxygen. the discovery of the oxygen bottles show that other men have faced the same challenges that hillary and tenzing are facing. the oxygen bottles provide an added level of security for hillary and tenzing that they will have oxygen available for their descent.