The puzzle of its vanishing act continues to frustrate investigators. Every clue seems to indicate a deliberate act. Theories abound, encompassing alien involvement. The reality remains unknown. ??????? ??? ??? ??? ????? ???? ??????. ?????? ??? ??????? ?? ??????, ???? ??. ???? ?????, ??. ??? ???? ??? ??? ??? ??? ??? ????? ????? . ?? ???