Just sayin...….
If those were steel-reinforced concrete and weighed 4-5 tons each, that method might actually work... 
Hmmm. Might also be detrimental to those tunneling under it...If those were steel-reinforced concrete and weighed 4-5 tons each, that method might actually work...
That's what tamped charges are for.Hmmm. Might also be detrimental to those tunneling under it...
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