Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on May 9, 2020 shows ice pinnacles on a glacial surface, known as seracs, on the north side of Mount Qomolangma in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)