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Absolutly nothing, unless - You don't like beeing in the dark, are claustrophobic, you can feel the brick walls coming in, the feeling of beeing buried, you are absolutely ok.
You have to trade this off against taking a very long walk over the top.
This tunnel is just short of a mile long they say!
From: WikiPedia
Also known as the Mile Tunnel, Foulridge is 1,630 yards (0.93 mi; 1.49 km) long and was built by Samuel Fletcher, following Robert Whitworth's 1789 survey. The tunnel is the longest in the country to allow passage of canoes and kayaks.
Please give a heading.
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