Throughout history, the phenomenon of undecayed human bodies has attracted widespread attention from both the scientific and medical communities. This mysterious occurrence has been observed not only in ancient times but also in modern society. In the Tang Dynasty, the monk Yuanji Zen Master consumed a special herbal soup before his death, and his body remarkably remained undecayed for a thousand years, becoming a world wonder. Similarly, during the Ming Dynasty, the remains of Master Wuxia were preserved by his disciples in gold, and after hundreds of years, they remained in perfect condition. In the 1930s, Japanese spies stole Yuanji's body, which was only discovered after the war, leaving the secret of its thousand-year preservation a mystery to this day. Additionally, the ancient corpses found in British marshes and the 8,000 mummies on the Italian island of Sicily reveal the secrets behind human preservation. What scientific principles lie behind these phenomena? What unresolved mysteries do they contain?