Destroyed by German bombs as early as 1914, Arras then fell under the command of the British Expeditionary Forces. In 1916 preparations began to link up the Arras quarries where a 24,000-strong army would be stationed before launching a surprise offensive against the German positions; the work involved creating some 19km of underground galleries. Videos, photos, letters, wall engravings and objects depict this epic adventure, in addition to a 20km-guided underground tour through the network dug by New Zealand miners during World War I.