The breakthrough ceremony of Cheung Shan Tunnel was held at its work site this month, marking a new milestone for the project.

The breakthrough ceremony of Cheung Shan Tunnel was held at its work site this month, marking a new milestone for the project.

The breakthrough ceremony of Cheung Shan Tunnel was held at its work site this month, marking a new milestone for the project.

The breakthrough ceremony of Cheung Shan Tunnel was held at its work site this month, marking a new milestone for the project.