into the unconscious has always been thought of as a descent into that other world, a reestablishment of the lost connections with the dead… All those stories in antiquity of the descent into Hades are of a similar kind; that was the old, primitive way of approaching the unconscious.
Jung identifies the katabasis myths of antiquity — above all Odysseus’s descent — as the archaic prototype of what depth psychology calls the approach to the unconscious, arguing that the structural logic remains operative in the present.
, Nietzsche’s Zarathustra: Notes of the Seminar Given in 1934-1939, 1988thesis