Built by the Great Northern Railway, the expected two-year construction period more than doubled due, in part, to water incessantly entering the workings. The fact that the tunnel was eventually completed is testament to the bravery and tenacity of all those involved.

Today this engineering miracle faces an uncertain future, with the threat of being infilled, buried and forgotten about. The video paints a picture of why it shouldn't be.

© Four by Three/Forgotten Relics 2014