a hindu story that describes the god's fight with demons to gain possession of a golden pitcher containi neck tar of immortality. during battle, some drops fell to the earth. smaller festivals are held more often at the spots where tradition says those drops fell. but this big picker pitcher festival is considered the holiest. they come out of seclusion and the event has become a meeting point for yoga practitioners around the world. authorities have constructed makeshift tents and medical facilities in the small town where the pilgrims are gathering but security is a huge challenge. another problem, dealing with severe pollution in the river. the government has banned pilgrims from using plastic bags and asked them not to use soap. industries have been put under new pollution restrictions. despite the problems and massive crowds, many pilgrims who make the trek say this will be the spiritual journey of their lifetime. i'm kim lawton reporting. >>> 100 million pilgrims. >>> that's our program for now. i'm bob abernathy. you can follow us on twitter and facebook a wach us any time onhe pb