In China, the tomb of Qin Shi Huang, the first emperor, remains unopened after 2,200 years. Discovered by farmers in 1974 in Shaanxi province, the tomb is surrounded by a terracotta army. Archaeologists have explored the area extensively but fear that opening the tomb could lead to irreversible damage. Historical texts from Chinese historian Sima Qian indicate that elaborate defenses were constructed around the tomb, including crossbows and traps to protect the treasures believed to be inside. Recent studies warn of mercury exposure from ancient mechanisms meant to simulate rivers and oceans. Projecting the potential dangers, archaeologists are considering non-invasive techniques to study the tomb without disturbing it. With the historical significance of this site, experts emphasize need for caution in the presence of these risks.