They were beaten by military police, kept in the pits for up to a week, and had food brought to them only once a day, Sergei said, who noted that he saw two pits at Prudboy, according to the report.

Experts think its treasures were from the ancient Shu kingdom, which dates back 4,800 years ago and lasted for 2,000 years. In the 1980s, two pits were excavated at the 12-square-mile site.