Mountain guides prepare to transport supplies to a camp at the altitude of 7,028 meters, at the advance camp of Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. Chinese surveyors aiming to remeasure the height of Mount Qomolangma rested up and prepared equipment on Friday at the advance camp of an altitude of 6,500 meters, while mountain guides set out to transport supplies to a camp at the altitude of 7,028 meters. Safety ropes to the peak are expected to be set up in the next two days, according to the mountain guides. [Photo/Xinhua]

A mountain guide prepares oxygen to be transported to a camp at the altitude of 7,028 meters, at the advance camp of Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides transport supplies including oxygen and fuel to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides transport supplies including oxygen and fuel to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides transport supplies including oxygen and fuel to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides transport supplies including oxygen and fuel to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides prepare to transport supplies to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides transport supplies including oxygen and fuel to a camp at the altitude of 7,028 meters, at Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]

Mountain guides prepare to transport supplies to a camp at the altitude of 7,028 meters, at the advance camp of Mount Qomolangma in Southwest China's Tibet autonomous region, May 8, 2020. [Photo/Xinhua]