Elijah said that it was just the same below or above. Compare Dante’s Inferno. The Gnostics express this same idea in the symbol of the reversed cones. Thus the mountain and the crater are similar… I assume that Dante got his ideas from the same archetypes.
Jung explicitly identifies Dante’s Inferno as an archetypal image drawn from the collective unconscious, homologous with Gnostic reversed-cone symbolism and with his own imaginal descents.
, The Red Book: Liber Novus, 2009thesis