How is the Hoan Kiem turtle preserved? VietNamNet Bridge - Modern plastination technology is helping the Vietnam National Museum of Nature to preserve the Hoan Kiem turtle. The Hoan Kiem turtle died in January 2016 and was handed over to the museum for preservation. The Hoan Kiem turtle is estimated at 200 years old. RELATED NEWSWill the Hoan Kiem turtle be cloned?