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minister saying the country has the most mines and trap explosives in the world. and tonight we have exclusive access to the team finding those mines. nick paton walsh is "out front" on the front lines. >> reporter: the fires still smolder at dusk. moving to the front, ukraine's counteroffensive. a few hours ago, intense bombardment around this area. and now is sun is setting, as the occasional round being fired. most of it seems to be towards russian positions. we're here to learn of a new tactic that may help ukraine overcome one of the hardest obstacles here, mine fields. shell fire is a constant overhead. the drone unit used daylight to help direct artillery fire.