News Nation's special show 'Rahasya' brings you some of the unsolved mysteries and paranormal investigations from across the globe. In today's episode we discuss about the skeleton lake in Uttarakhand's Roopkund, where skeletons of about 200 people were discovered in the year 1942. Where these skeletons came from? Whom do they belong to? What exactly happened near this frozen lake in Uttarakhand? Watch full bulletin to get the answers to your billion-dollar questions.