Vital role

Upon its completion, the 5G network will cover all the climbing routes of the north slope to the summit.

Tashi Tsering, a Tibetan mountaineering guide, said 5G coverage on Qomolangma was crucial for contacting emergency rescue services.

"Many climbers come from zero-altitude places, so altitude sickness is a common problem for most people, and it is worse at altitudes such as 6,500 meters," he said.

Wang Xiaobo, an employee of the networks department of the Tibet branch of China Mobile, said, "It's a challenge both for the mind and body to work at such high altitudes," adding that many of his colleagues suffered problems such as dry skin, sleep loss and headaches.

"Due to the harsh environment and the lack of oxygen, the transportation of materials and construction work was very difficult up there, and more than 40 yaks and 60 workers were hired to carry the materials."

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