Why didn't the Gong Yi Tunnel start?

The geographical environment is complex.

1. Complicated geological conditions: Gong Yi Tunnel is close to Yarlung Zangbo suture zone and parallel to Jialipalong Zangbo active fault, with extremely developed surface disasters and extremely difficult construction.

2. Technical problems and safety risks: Tunnel construction in complex geographical environment needs to overcome many technical problems and safety risks, and needs to invest a lot of manpower, material resources and financial resources.