Ranwu Tunnel in southwest China's Xizang on National Highway 318 is completed! At 4,200m altitude, builders overcame extreme conditions in 426 days, cutting Baxoi-Ranwu travel time by half!■
Ranwu Tunnel in southwest China's Xizang on National Highway 318 is completed! At 4,200m altitude, builders overcame extreme conditions in 426 days, cutting Baxoi-Ranwu travel time by half!■