The Lochnagar mine was an explosive-packed mine created by the Royal Engineer tunnelling companies, located south of the village of La Boisselle in the Somme département of France, which was detonated at 7:28 am on 1 July 1916, the first day of the Battle of the Somme. The Lochnagar mine, along with a neighbouring mine north of the village known as the Y Sap mine, contained 24 tons of ammonal. At the time these mines were the largest ever detonated. The sound of the blast was concerned the loudest man-made noise in history up to that point, with reports suggesting it was heard in London.
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