HOW IT HAPPENS
Mount Elbrus standing massively at 5642 m (18,510 ft.) is one of the Seven Summits, and the highest peak on the European continent. Mount Elbrus climbing is not technically difficult, however still gives the climber very high altitude expose. The biggest challenge when climbing Mount Elbrus is to overcome the high altitude and the lack of oxygen. At high altitudes above 3,800 meters, mountain sickness arises from the lack of oxygen. The higher you ascend; the more discharge is the air. Although there is as much oxygen at high altitudes as at sea level (21%), atmospheric pressure is much lower up there. Since the air molecules of all its constituent gases are located at a greater distance from each other, breathing in the usual volume of air, we breathe less oxygen (O2). The partial pressure in the lungs becomes narrowed. As a result, blood oxygen saturation decreases. If a climber without/or with bad acclimatization continues to ascend, he will end up with cerebral or pulmonary edema or heart failure. These are the most basic risk components of climbing at high altitudes. Therefore, at high altitudes we use step acclimatization, that is we first ascend to a certain height then descend, etc. Normally, it takes at least 8 days to climb Mount Elbrus. That is the time required for the human body to get used to high altitude environment and the lack of oxygen in big mountains. For successful acclimatization, you must have the minimum required climbing experience to know how your body reacts to high altitude conditions. You need to either climb big mountains regularly or take part in high-altitude training programs with a personal coach. Both require a lot of time, effort, and money. When climbing Mount Elbrus your body gets significantly less oxygen than it gets at a more familiar altitude to you. That is a fact and the main problem you have to deal with.
The lack of oxygen, which is the main risk factor when climbing Mount Elbrus, is eliminated in this program, because we climb with oxygen.
Moreover, while conquering the summit with oxygen, you will feel the same way you feel below, but if necessary, you can even get more oxygen than you get at normal to your body altitude. It is achieved by the flow selector which is controlling the oxygen supply rate. Therefore, with oxygen you can go faster and feel much better than those who already have acclimatization but go without oxygen.
That is why Elbrus Spacewalk program does not require having multi-day acclimatization for successfully reaching the summit of Mount Elbrus in just 1 day.