Upanishad Ganga S01 E24 Adhikari - The Seeker of Knowledge

Nachiketa, son of Vajashravas, meets Lord Yama, the God of Death. Granted 3 boons by Yama, Nachiketa desires to know what is Death, what comes after and what is not impermanent. Yama replies that only the soul (Atman) is indestructible.