1. DIFDL UIF DMPDL = CHECK THE CLOCK. Letter C.
2. Dots 1, 3, 6, 10, 15, 21 (add 2, 3, 4, 5, 6). 21 = U.
3. On the Moon they land at the same time: R.
4. Behind X or Y, two signs are true. Behind I, only Sign X is true: I.
5. The flashes spell LOOK UP. The letter that appears twice is O.
6. Five pointer-gaps past the top pointer is star U (K is a trap at 2½ gaps).
7. I AM THE LETTER THAT HISSES LIKE A SNAKE: S.

Vault password: CURIOUS