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A similar situation existed during World War One in Belgium. British miners dug six tunnels and caverns under the German trench system, and also packed those six caverns with gunpowder. When detonated, each explosion was on the level of a tactical nuclear weapon!!
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[Some interesting comments about this effort of the British. The Royal Engineer, a Captain, was electrocuted in detonating the explosives in the caverns. Six caverns were filled with gunpowder, but only four of them detonated. And the exact location of the two unexploded caverns was lost. The general location is know, but to this day, somewhere in Belgium, are two huge caverns of explosives waiting to go off, each being equal to a tactical nuclear weapon! It is also said that Lloyd George, then Prime Minister of England, waited quietly in his study in anticipation of the detonations, as he knew the exact time when they would occur, and that the shock of the explosions could be felt as far away as London, one hundred and twenty miles away!!].
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