13. The local villagers hung on the precipice and cut out 13 holes with steel hammers, which opened the door for the outside world to enjoy the cool world of the mountain village, and also opened the way for the local villagers to get rich and the ecological development of mountain scenery. On July 7th, the middle route project of South-to-North Water Transfer Project, one of the national key water conservancy projects, started construction in danjiangkou city, Shiyan. This water conservancy project, which costs nearly 60 billion yuan, will transfer water from the Yangtze River to the Han River for replenishment to relieve the water pressure in Danjiangkou Reservoir.