books.google.ca - Below the battlefields of the Western Front, fifty thousand tunnellers, sewer workers, and miners were engaged in mine warfare in the Ypres Salient--a secret struggle beneath No Man's Land that combined daring engineering, technology, and science with calculated assassination. Few on the surface knew...http://books.google.ca/books/about/Beneath_Flanders_Fields.html?id=wLZjfmkh3jYC&utm_source=gb-gplus-shareBeneath Flanders Fields
