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Greek Mythology/Beasts/Charybdis
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Charybdis was a sea-monster that swallowed vast amounts of water, causing whirlpools in the sea, which could swallow nearby ships. Charybdis stay near to Scylla, another monster on a cliff, so that ships that wished to pass by needed to choose between encountering Charybdis or Scylla. Odysseus, choosing between the two, feared Charybdis the most, so encountered Scylla.