Here is a link to the recently opened tunnel system at the Glory Hole , La Boiselle on the Somme Battlefield.
This village was one of those assaulted on the 1st July 1916 the first day of the Battle and is adjacent to the famous Lochnagar crater.
Truth about Somme's underground warfare as secret passages are re-opened almost 90 years on | Mail Online
cheers
Paul
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