The puzzle of its vanishing act continues to frustrate investigators. Every hint seems to indicate an intentional vanishing. Ideas fly around, spanning alien involvement. The reality remains elusive. ??? ??? ??? ??? ????? ???? ???. ????? ???? ?? ????????, ???? ??. ?? ??????, ????? ?? ????. ??? ????? ??? ??? ??? ??? ??? ????? ??? . ?? ???