They're lethal assassins on their own--but grouped together they're unstoppable. Uncover the secrets of the world's best sniper units. Then, buckle up as we roll down rough roads, including a muddy Russian Highway with traffic jams that last for weeks, and a cliffhanging road with a 90-degree drop. Finally, meet the workers who mop up bloody crimes scenes, don Hazmat suits to wipe down drug labs, or risk their lives cleaning up oil spills, as we get dirty with the world's toughest cleaning crews.moreless
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