Thirty years ago, a discovery was made, here that stunned, the world. I've been given, special access to, one of china's, most extraordinary, archaeological treasures. Incredible. Could this amazing find, help answer the mystery, of what happened, at shamau? I've been allowed, privileged access to, an amazing relic, of an ancient, Chinese civilization, that I hope, could hold clues, to the abandonment of, shamal. When I see this, when I'm confronted, with this, I feel like, I'm in the presence, of something, otherworldly. This astonishing bronze, mask is evidence, that there was another, completely unknown, Chinese civilization, that existed about, five hundred years after, shemo. This is like, nothing else I have seen, in China, and when this was found, this was like, nothing anyone had, ever seen in the world. It's just one of, a treasure trove, of precious objects, found at the site, of an ancient city, called sanang Shun d. There are scores of, giant faces, striking bronze heads, with golden masks. And human like, sculptures, performing, mysterious rituals. I just can't believe, how many bronze objects, there are and, the variety is, extraordinary. The world's leading, expert on sang shin de, believes the giant mass, depict gods and, the bronze heads, represent the rulers, of the city. Indu we found, many bronze heads in Sha, xindui, but we can divide them, into two types yo, some of them have long, braided head yo, and some of them don't. Her. Professor sun believes, these masks, with two distinctive, hairstyles, represent the two, different clans who, ruled the city, and his theory, could help answer San, sh Di's most puzzling, question. Just like at chimao, the city seemed to, suddenly disappear.