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The Tunnel

The tunnel route generally runs within the Hythe beds, which are mainly formed of layers of sands and sandstones which can be highly variable in their nature. Underlying the Hythe beds is the Atherfield clay. The top of the Atherfield clay is marked by a spring-line which can be seen in the Devil's Punch Bowl and within the Boundless Copse areas. Boreholes at the top of Hindhead Common will encounter the full thickness of the Hythe Beds while those within Boundless Copse will encounter the Atherfield Clay near the surface.

Cross Section

A larger image of the cross section is available to view here.

Photomontage of the northern tunnel portals and principal services building in Boundless Valley

A view in the tunnel showing the proposed safety features

A view in the tunnel showing the proposed safety features