A cave with a hole in its roof that drops a green-gold column of light onto the water inside, where you can swim. Less famous…A cave with a hole in its roof that drops a green-gold column of light onto the water inside, where you can swim. Less famous than the Blue Cave on Biševo, twenty minutes away, and far less crowded, the classic Vis double-header for a charter day. Part of the Vis archipelago, closed to foreigners until 1989 as a Yugoslav naval base. That accidental preservation is why these islands have the clearest water and least development in the Adriatic. Anchorage: Day anchor off Ravnik; overnight in Vis town or Stiniva. Hazards: No site-specific hazards noted, brief normally. More