Figure 8.
The image consists of a diagram and two photographs illustrating the process of bulkhead removal for constructing the Lee Tunnel. The main diagram on the left shows a 3 D representation of the site with labelled components, including Shaft G and Shaft F, and indicates the location of the existing concrete bulkhead. Flow arrows depict the direction of connections and airflow. The top right photograph captures the view from Shaft G, showing the tunnel interior and structural elements. The bottom right photograph provides a view from Shaft F, revealing the tunnel entrance and concrete walls. The images collectively convey the stages involved in the tunnelling process.Formation of the LTT