’One of China’s hardest tunnel projects’ completed after 12 years

The Dazhu Mountain Railway Tunnel, dubbed as “one of China’s hardest tunnel projects,“ was completed on Tuesday after 12 years of work. The tunnel is a key part of a railway that connects Dali City and Ruili City in southwest China’s Yunnan Province. Subscribe to us on YouTube: Download our APP on Apple Store (iOS): Download our APP on Google Play (Android):