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Nat Geo embarks on an expedition to Papua New Guinea to understand human mummification. Our goal is to find a well-preserved mummy to gain clues into this incredible form of mummification in the tropics. Nat Geo cameras travel to Koke, a native village with an ancient mummy tradition, to learn about their process of mummification and assist with the restoration of an aging mummy. We'll trek through caves, villages and mountains to uncover the secrets of the ancient tradition.