In Greek mythology, there are two distinct ways to communicate with the dead:
- A Nekyia (νέκυια) is a ritual to summon the dead. An example of this is Odysseus in the Odyssey.
- A Katabasis (κατάβασις) is a journey into the Underworld while still living. Heracles is one hero who did this.
Who did these things and what were their reasons? Was it personal? Did a god tell them to? Is it some labor (Heracles) they must complete? Or something else?