At 11:30 on December 26, along with the cheers from the tunnel, HBNZQSG-3 standard Dadongcun tunnel, which was invested by Sichuan Railway Investment and constructed by China Railway 21st Bureau, was successfully completed. It was the first tunnel to be penetrated among the 15 tunnels in the third bid section of the project. It also marked the completion of another major node goal of the Hanbanan Railway project in the labor competition of the "Fourth Quarter Decisive Start Year for the Majors" and laid a solid foundation of annual output value plan.