Charybdis
Charybdis is a sea monster of
Greek mythology who dwelt alongside Scylla in the Strait of Messina, which separates peninsular Italy from the island of Sicily. She lived beneath some rocks on the island and three times a day swallowed enormous quantities of water, drawing into her voracity ships, sailors, fish, and everything else she might encounter in her path.
At other times, she disgorged what she had swallowed with horrible noises, forming a dreadful and terrible whirlpool from which no one escaped. Her presence remained invisible because she always concealed herself behind a thick fog.
Only Odysseus (Ulysses) managed on two occasions to escape her horrible jaws.