English: Lochnagar Mine Crater at La Boisselle, Somme, France in 1984. Pupils from Holyrood High School Edinburgh provide a sense of scale as they explore the ground.

"La Boisselle, after being battered by us in our attack, was destroyed by enemy fire after we had taken it, and then cleared by our men who wished to use the roads. It offers no sight of any interest; but just outside it, between the old lines, there is a stretch of spur, useful for observation, for which both sides fought bitterly. For about 200 yards, the No Man's Land is a succession of pits in the chalk where mines have been sprung. (...) The lines cross this debated bit, and go across a small, ill-defined bulk of chalk, known as Chapes Spur, on the top of which there is a vast heap of dazzlingly white chalk, so bright that it is painful to look at. Beyond it is the pit of a mine, evenly and cleanly blown, thirty-five yards deep, and more than a hundred yards across, in the pure chalk of the upland, as white as cherry blossom. This is the finest, though not the biggest, mine in the battlefield. It was the work of many months, for the shafts by which it was approached began more than a quarter of a mile away. It was sprung on the 1st of July as a signal for the attack." -- J Masefield, The Old Front Line, 1917