![](http://www.ecns.cn/hd/2023/03/29/f630aa32bb7d479c8a562df6c3d9f2d8.jpg)
Drone photo shows the S5 expressway connecting Lhasa and Tsetang in Zhanang County of Shannan, southwest China's Tibet Autonomous Region, March 28, 2023. (Photo: China News Service/Jiang Feibo)
The left line of Guigala Tunnel was drilled through on Monday.
![](http://www.ecns.cn/hd/2023/03/29/39e40d3340944920b8c8480ca39e2862.jpg)
A ceremony is held to celebrate the drill-through of the left line tunnel on S5 expressway connecting Lhasa and Tsetang in southwest China's Tibet Autonomous Region, March 28, 2023. (Photo: China News Service/Jiang Feibo)
![](http://www.ecns.cn/hd/2023/03/29/a6050314fec543a7a33dd4ff16dbde81.jpg)
Drone photo shows the S5 expressway connecting Lhasa and Tsetang in Zhanang County of Shannan, southwest China's Tibet Autonomous Region, March 28, 2023. (Photo: China News Service/Jiang Feibo)
![](http://www.ecns.cn/hd/2023/03/29/47e23316df104e4d8b3ab2e26b84f27b.jpg)
Drone photo shows the Dagze section of S5 expressway connecting Lhasa and Tsetang in Lhasa, southwest China's Tibet Autonomous Region, March 28, 2023. (Photo: China News Service/Jiang Feibo)