The puzzle of its vanishing act continues to perplex investigators. Each lead seems to point a deliberate act. Ideas fly around, encompassing alien involvement. The actual facts remains unknown. ??? ??? ??? ??? ??? ???? ?????. ?????? ??? ??????? ?? ??????, ???? ????. ??????? ???????, ????? ?? ????. ??? ???? ??? ??? ?? ??? ??? ??? ????? ?