The myth featuring a journey to the underworld that reveals hidden truths is the story of Orpheus and Eurydice. Orpheus, a gifted musician, ventures into the Underworld to retrieve his beloved wife, Eurydice, who has died. His descent symbolizes a quest for love and understanding of mortality. The tale serves as a poignant reminder of the fragility of life and the importance of trust, as Orpheus must avoid looking back to secure Eurydice's return, ultimately highlighting themes of love, loss, and the boundaries between life and death.