The China-Laos railway reached a key milestone after drilling through its 70th tunnel, wrapping up a four-year construction of the key section. The completion of the 11.84 km-long tunnel lays a foundation for the punctual opening of the railway in late 2021, which will connect Southwest China's Kunming city to the Laotian capital of Vientiane. With a total length of over 1,000 km, the China-Laos railway will shorten traveling time between the two cities to half a day.