This new drone can fly to and map places too dangerous for people

Around the world, mines are often dark, dangerous places where humans fear to tread. Mapping them can be a perilous task, involving surveyors who must enter with equipment at the risk of personal injury. But now, a Philadelphia company has developed a drone system that can enter a mine and, at the touch of a button, fly autonomously through the darkness and fully map the space in 3D.