Following is a transcript of the video. Vanessa O'Brien: 26,000 feet or 8,000 meters, they do call the "death zone." The death zone is, you know, a part of what happens at height in the mountain.

There are only 14 places on Earth where you can enter the death zone, places where the oxygen pressure is so low that there’s simply not enough to sustain human life beyond a matter of hours.

But if climbers want to summit Mount Everest, the tallest peak in the world at 29,029 feet (8,848 meters or 5.5 miles) above sea level, they have to brave what's known as the "death zone." ...

But this year was the first time that authorities set a goal to retrieve five bodies from the so-called “death zone”, above an altitude of 8,000m (26,247 feet). In the end the team - who ...