According to historical records, when Qin Ershi buried Qin Shihuang, he ordered the palace ladies to be martyred if they had no children. In order to prevent "leakage", all the craftsmen who participated in the construction of the tomb closed the tomb door and buried them alive before they came out.
Extended data
General situation of Qin Shihuang mausoleum:
The Mausoleum of the First Qin Emperor is the mausoleum of Ying Zheng, the first emperor in China (259 BC-2 BC10). It is located at the northern foot of Lishan Mountain, 5 kilometers east of Lintong County, Shaanxi Province, north of China. The mausoleum of the First Qin Emperor was built from 246 BC to 208 BC, which lasted for 39 years. It is the first large-scale and beautifully designed imperial mausoleum in the history of China.
The mausoleum of Qin Shihuang was originally named Mount Li or Mount Li. According to the people of the three kingdoms, "the grave is more than 50 feet high, and it is more than five miles a week." The converted height is120m, and the bottom circumference is 2160m. Planting grass and trees on it really looks like a mountain.
Li Daoyuan, a great geographer in the Northern Wei Dynasty (AD 466 or 472? -527) said that because the area where the first imperial tomb was located was sandy and lacked pure loess, it was transported from the low-lying area near Wujiazhaizi, five miles northeast of the mausoleum. This "Mount Li", built entirely by manpower, shows the wisdom and strength of the ancient working people.
References:
People's Network-World Cultural Heritage: Mausoleum of the First Qin Emperor
Baidu Encyclopedia-Mausoleum of Qin Shihuang