A royal tomb inaccessible underground for over two thousand years
The mausoleum of the first emperor, Qin Shi Huang, located near the modern-day city of Xi’an in China’s Shaanxi province, is one of the most monumental funerary structures of antiquity.
Commissioned in the 3rd century B.C., it houses the tomb of the man who unified China and remains closed and intact to this day.
Although the outer complex has been partially excavated, the central sarcophagus chamber has never been opened, making it one of the world's greatest documented historical mysteries.
Who was Qin Shi Huang and why is his tomb exceptional?
Qin Shi Huang (259–210 B.C.) was the first emperor to unify China's warring kingdoms into a single centralized state.
He established administrative, monetary, and legal reforms that laid the foundations for the Chinese empire for centuries.
Mindful of his legacy, he ordered the construction of a colossal mausoleum to represent his power even in death.
According to historical sources, over 700,000 workers participated over the course of decades in the construction of the funerary complex, which symbolically replicates his empire underground.
Archaeological discovery of the mausoleum and the Terracotta Army
The mausoleum was identified archaeologically on March 29, 1974, when local farmers accidentally discovered fragments of pottery and other unexpected remains, which triggered subsequent excavations that led to the discovery of the Terracotta Army figures near the mausoleum of the first emperor, Qin Shi Huang.
Chinese archaeologists have excavated thousands of life-sized soldiers, horses, and chariots arranged in military formation.
However, these excavations are concentrated in the peripheral pits.
The central tumulus, which covers the emperor’s tomb, remains unopened and has been studied only through non-invasive techniques.
Why has the sarcophagus chamber not been accessed yet?
Chinese authorities have forbidden the opening of the central tomb for several scientifically grounded reasons.
First, there is fear of the destruction of organic materials and pigments, as happened during the initial excavations of the terracotta army, whose original colors degraded upon contact with the air.
Furthermore, geological and chemical studies have detected abnormally high concentrations of mercury inside the tumulus, which poses a risk both to researchers and to the preservation of the site.
Current technology does not guarantee a safe excavation.
What do historical sources say about the interior of the mausoleum?
The primary ancient text describing the tomb is the Shiji (Records of the Grand Historian), written by Sima Qian in the 1st century B.C.
According to this account, the burial chamber contains a miniature model of the empire, with palaces, mountains, and rivers represented by liquid mercury to simulate the flow of water.
It also mentions a ceiling decorated with celestial bodies and defensive mechanisms designed to prevent intruders from entering.
These descriptions were considered legendary for centuries, but today they have partial scientific backing.
Modern scientific evidence confirming the mystery
Investigations conducted with geophysical sensors and soil analysis have confirmed elevated levels of mercury around the burial mound, far exceeding natural levels.
This data coincides with the accounts in the Shiji and proves that at least part of the historical description is accurate.
Likewise, radar studies have identified internal structures consistent with a large central chamber, reinforcing the idea of a complex and still intact funerary architecture, which modern technology is not yet ready to uncover, but which perhaps one day may be viewed in all its splendor without being risky or endangering those who attempt to discover it.
