This cell shows the beginning of the story. Here, the derelict ship is seen coming towards the Three Skeleton Key. The lighthouse is lit, because they haven't yet seen what would become of them. The water is infested with sharks, as mentioned in the story.
This cell shows a post-ship crash view of the Three Skeleton Key. The island is infiltrated by the rats, but the sharks have killed some of them off. The broken ship is around the shore of the island, but the lighthouse is still lit.