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the WWI battlefields still hold a nightmare of unexploded shells and mines. The mines consist of tens of thousands of lbs. of explosive buried in tunnels underground, some took years to dig.
https://www.chemistryworld.com/features/the-great-war-clean-up/3009456.article]
https://news.nationalgeographic.com/2017/06/biggest-blast-before-atomic-bombs-messines-world-war/]
At Messines 19 planted mines went off, some of it didn't its tonnage of explosives remains underground .
I was there last yr, there is a farm directly above one of these sites today. someday....someday. 
https://en.wikipedia.org/wiki/Mines_in_the_Battle_of_Messines_(1917)]
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