On this day, 27 years ago, on October 19, 1998 (August 29, 1998, the lunar calendar), humans walked through the world's largest canyon for the first time. The Yarlung Zangbo Grand Canyon is a U-shaped alpine canyon like a horseshoe. The straight line distance between its two ends is less than 40 kilometers, but the drop in the river bed has dropped sharply from an altitude of about 2800 meters to 600 meters. The fact is very clear that the Yarlung Zangbo River Grand Canyon is the deepest Grand Canyon in the world. China scientists had planned to set out twice a few years ago to enter the Grand Canyon, but they ran aground because they had no money. On October 19, 1998, this scientific expedition finally took place. Scientists walked through the Grand Canyon, which no one had yet crossed completely in history, because they couldn't get true knowledge unless they were there in person. There is a place called Medog in the Grand Canyon. In Tibetan Buddhism, it means paradise. In the hearts of Xizang people, it is an unreachable paradise. After 42 days of trekking, the scientific expedition team arrived at this mysterious paradise. With a large amount of precious first-hand information, they successfully joined forces in Zhaqu, engraved with 15 golden characters "The first time mankind crossed the Yarlung Zangbo Grand Canyon on foot" The commemorative plaque stands tall on the hillside of Zhaqu Village at the top of the Grand Canyon's Grand Bend, marking that this feat in the history of human exploration has since been recorded in history.