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Moai undergoing preservation efforts in 2003 at Ahu Tongariki with Poike Volcano in the background. The second Moai from the right has a Pukao on its head. Ahu Tongariki is the largest Ahu on Rapa Nui/Easter Island. Ahu Tongariki was substantially restored in the 1990s by a multidisciplinary team headed by archaeologists Claudio Cristino and Patricia Vargas.