Lei Yu is a researcher at the Sichuan Provincial Cultural Relics and Archaeology Research Institute, and the director of the Sanxingdui Site Workstation. In an interview with CGTN's ICON, Lei shares the moment when bronze artifacts were discovered in pit No. 3 at Sanxingdui, an archaeological site associated with the ancient China's State of Shu. Prior to the discovery, he'd thought that pit No. 3 wasn't a sacrificial pit. But now he acknowledges it probably was, just like the first two pits excavated at Sanxingdui.