CHARYBDIS

[Greek] Charybdis was once a nymph-daughter of Poseidon and Gaia who flooded lands for her father's underwater kingdom until Zeus turned her into a monster and have her suck in and out water three times an day. She lived in a cave at one side of the Strait of Messina, opposite the monster Scylla, the two of them forming a dangerous threat to passing ships.