One meaning of katabasis is the epic convention of the hero's trip into the underworld. In Greek mythology, for example, Orpheus enters the underworld in order to bring Eurydice back to the world of the living.
Most katabases take place in a supernatural underworld, such as Hades or Hell — as in Nekyia, the 11th book of the Odyssey, which describes the descent of Odysseus to the underworld. However, katabasis can also refer to a journey through other dystopic areas, like those Odysseus encounters on his 20-year journey back from Troy to Ithaca. Pilar Serrano allows the term katabasis to encompass brief or chronic stays in the underworld, including those of Lazarus and Castor and Pollux.
Read more about this topic: Descent To The Underworld