Deqing high-speed railway tunnel in south China drilled through

The 6.61-km-long Deqing Tunnel, a critical project in the construction of the Guiyang-Nanning high-speed railway in Hechi, south China's Guangxi Zhuang Autonomous Region, was drilled through on Tuesday.

As the tunnel is located in a typical karst landform, its construction met many difficulties due to the complicated geography and landform.

The Guiyang-Nanning high-speed railway is expected to be put into operation by the end of 2023. With a total length of 512 kilometers, the railway line will cut travel time from Nanning to Guiyang from over 10 hours to 2 and half hours.