In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Photo taken on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Photo taken by smartphone on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Aerial photo taken on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Aerial photo taken on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Photo taken by smartphone on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Photo taken on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)

In pics: advance camp at altitude of 6,500 meters on Mount Qomolangma

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Photo taken by smartphone on May 22, 2020 shows the advance camp at an altitude of 6,500 meters on Mount Qomolangma. The advance camp sits on a slope next to the end of the East Rongbuk glacier and is the last camp before the snow line and the ice and snow road. Known as the `devil camp,` many of the professional mountain guides, who have reached the peak of Mount Qomolangma countless times, also suffer from altitude sickness here due to its geographical location. It`s an area surrounded by mountains with relatively poor air circulation. (Xinhua/Jigme Dorje)