Revolutionizing Navigation with Cosmic Rays.

Scientists have developed the world's first underground GPS system, called the muometric wireless navigation system (MuWNS), which uses cosmic rays to triangulate the position of a receiver buried deep beneath the ground. The technology can be miniaturized to fit inside devices such as smartphones and could be used to monitor volcanoes and aid in future search-and-rescue missions. MuWNS can map the interiors of otherwise inaccessible places, such as pyramids, volcanoes, and the fiery hearts of nuclear reactors.