How to clear a minefield in just a few seconds: blow it to hell.
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This is the M58 MICLIC (mine-clearing line charge) in action. Put simply, it’s a rocket on a string. Put less simply, a 5-inch rocket is launched from a carrier vehicle and tows behind it a string, which gets laid down over a mine field. This is a string with a bit of a difference, though… it’s 350 feet long and carries with it five pounds of C4 plastic explosives. That’s five pounds of C4 PER FOOT. When the line is laid down, the C4 is set off, and 350 feet of terrain gets a mighty whoopin’. Most (but not all) types of mines and IEDS will sympathetically detonate if they are anywhere nearby. This would, I imagine, also be handy for dealing with small buildings, guys in spiderholes, trenches, etc.