Expert miners start HS2 tunnel emergency cross passages

Construction of HS2’s longest tunnels stretching for 10 miles under the Chilterns has begun a new phase with the start of work on thirty-eight cross passages linking the northbound and southbound tunnels.
The 15m-20m long escape tunnels are bored every 500m to connect the two main running tunnels around 40m below the surface.
An expert team of miners are using a remotely controlled excavator to break out of and excavate from one running tunnel to the adjacent tunnel.As the excavation is pr