Katabasis is the journey taken by a hero to Hell (The Underworld to the ancient Greeks). The aim of the journey was to acquire valuable experience and learn a lesson that would not only positively transform the individual but also the community whose the hero belonged to. Therefore, not only did the individual gain precious knowledge to lead a better life but also the other members of the community.
The advancements engendered by such experiences meant that life in the social, religious, philosophical, technical and psychological fields was greatly improved.
So, next time someone tells you to go to hell, take the journey gladly as it will grant you better knowledge of life and the respect and admiration of those around you.