Galerie d’aérage Not sure what this tunnel was, it lies underneath an old coal mine, so could have been an ventilation tunnel. Share this:FacebookPinterestMoreTumblrLinkedInEmailPrintTwitterLike this:Like Loading... Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed.