During WWI the 1st Australian Tunneling Company Placed 450,000 kg of explosives behind enemy lines and detonated them, killing 10,000 German Soldiers.
Hill 60 was a strategically significant place of high ground. It was created as a result of digging for a nearby railway. The Germans captured the hill from the French in 1914. Both sides fought for it and coveted it for the remainder of World War I.
Something unique about Hill 60 was that a number of battles were fought underground by engineers and tunnellers on both sides.
The First Australian Tunneling Company took over the mining of Hill 60 in 1916. On June 7, 1917, at the beginning of the Battle of Messines, 19 mines were filled with 450,000 kilograms of explosives. They were detonated under the German lines.
It blew a large portion of the hill to smithereens and killed 10,000 German soldiers. Even though only 19 of the 21 mines exploded, it was one of the loudest explosions in history.
They said it could be heard in London and Dublin. A memorial to the Australian troops killed there during the war was put at the site.