This is in the Epic of Gilgamesh which has a flood story that is similar to the Noahic Flood in Genesis. Utnapishtim apparently overheard the gods discussing making the flood on man. Utnapishtim advises Gilgamesh.
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Utnapishtim was granted immortality by the gods after surviving the flood, making him the only witness with firsthand knowledge of the event. This allowed him to share the story with Gilgamesh in the Epic of Gilgamesh.