Mines in the Battle of Messines, Underground explosive network in Mesen, Belgium
Mines in the Battle of Messines form an underground tunnel system running beneath the ridge near Mesen, built for the June 1917 offensive. The passages reach different depths and connect blast chambers filled with ammonal explosive material.
British units detonated nineteen charges on 7 June 1917, breaking through German defenses along a front of roughly six miles. Work on the tunnels had started in 1916 and required experienced diggers from several countries.
The underground network represents a testament to military engineering, involving British, Canadian, and Australian tunneling companies working in challenging conditions.
The crater at Spanbroekmolen offers access to the site and sits roughly two kilometers from the village center along the road toward Nieuwkerke. Signs on location guide the way and a short path circles the edge of the depression.
Six of the original twenty-five prepared charges never exploded and remain buried today. One of these went off unexpectedly in 1955 when lightning struck a field.
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