How high can humans go in the air?
How high can humans go in the air? Above about 8,000 meters (26,000 feet), the human body cannot survive at all, and starts to shut down. Mountaineers call this altitude the death zone. To prevent severe altitude sickness, mountaineers bring supplemental (extra) supplies of oxygen and limit their time in the death zone.
What is the safest altitude?
One thing that pilots and prospective aircraft dispatchers need to understand is that there is not one universal safe altitude since some terrains or objects may be taller than others. Rather, the accepted metric is that this altitude needs to be at least 500 feet above the terrain or obstacle in question.
At what altitude does hypoxia start?
In aeronautics, hypoxia typically results from a decompression or lack of pressurisation of the aircraft cabin. Hypoxia occurs within a few minutes if the cabin pressure altitude rises to between 5,000-6,000 m (about 16,000 - 20,000 ft).