Um... I could be completely wrong on this, but I had taken the story as that when Circe transformed Scylla into the 6 headed, 12 legged being, that she also had rooted her to a rock in the Strait of Messia, opposite the whirlpool Charybdis. I know that most books on mythology differ slightly, but I've never read or heard anything about Scylla living in a cave. But as I said, I could be wrong.
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