Seperation/Displacement
I think what the show has taught me about underworld journeys is that they experience you. Even if the purpose of the quest is to find your own will (like in Dante’s Inferno), the hells chew you up, spit you out, and now you know how to dodge the jaws of death like a champ. The underworld journey is meant to swallow the traveler, so that they never know when they will see the light of day. She/he is meant to be separated from their familiarity, to be displaced into a world that they could never imagine. They will learn of all the icky insides and once they are expelled back into reality, they will come out almost anew. I know when I found my way out the deep bowls of the McKittrick, I loved the smell of the cold fresh air and made my way back home to dream again of the dances and mayhem, and tried to decipher what they meant.