I have read several books about the Great War but knew nothing about the war going on below ground on the Western Front. This book is a real eye opener as to what was happening beneath the trenches. There were 1000's of guys involved in tunnelling under German lines to plant tons and tons of explosives at many places along the front in order to blow up enemy trenches to try and possibly shorten and win the war. There were 1000's of casualties on both sides due to the effects of this form of warfare, and huge craters left all along the Western Front. This is a well written book with plenty of illustrations and photos, recommended reading for those with an interest in the Great War.