2. The Mausoleum of Qin Shihuang is an underground "kingdom" full of magical colors. The deep underground palace is full of mystery, which has aroused many speculations and reverie of literati for thousands of years. What kind of structure is the underground palace? How many treasures are hidden in the underground palace? Is there an anti-theft mechanism in the underground palace? How deep has the underground palace been dug? Is Qin Shihuang a bronze coffin or a wooden coffin? Is Qin Shihuang's bones intact? This series of suspense puzzled experts and scholars. At present, we can only make a preliminary discussion and speculation based on the existing archaeological materials and related historical documents.
Whether there is mercury in the first imperial tomb has always been a mystery. The development of modern science and technology provides a necessary prerequisite for verifying the eternal unsolved case of buried mercury in Qinling underground palace. After repeated tests, geologists found that there was indeed a "mercury anomaly" in the soil sample of the first imperial tomb. On the contrary, soil samples from other places have almost no mercury content. Scientists have drawn a preliminary conclusion from this: the record of a large amount of mercury buried in Qin Shihuang's mausoleum recorded in historical books is reliable.