Landmines never stop waiting. The simple machines are explosives with triggers, set in the ground primed and ready for someone to set them off. For landmines, the war never ends. For humans, war does, and the landmines that once marked the front line between warring factions can change instead to deadly artifacts, a lethal trap for anyone who wanders unknowingly into danger. Getting rid of landmines is a humanitarian concern. To solve it, scientists from the University of Bristol are enlisting the help of drones.