But Gilgamesh is not ready to accept this. He struggles on, as many of us struggle on to find a meaning in death. Finally he finds Utnapishtim and his wife. They are the survivors of the Great Flood and have been given the gift of immortality. Gilgamesh finds it then loses it to the sneaky serpent.
Immortality is lost.
Gilgamesh has indeed travelled where no other dares venture. He travelled the underworld and met the Great Survivors of the Flood. He held the secret to everlasting life in his hand for a brief moment. And he has lived to tell about it. Siduri was right, but Gilgamesh had to live and lose in order to realize it.