Epiphany, Russia
In Ancient Rus it was thought that anyone who submerged themselves in an ice hole on Epiphany would wash away their sins. This Christian holiday is dedicated to the baptism of Jesus Christ in the River Jordan by John the Baptist, which is why it is believed that on this day the water in every reservoir is consecrated and has healing properties. If you wish to join in then you can search online for an ice hole where you can participate in the sacred rites.