Luo Feng explained, "Each dynasty had different burial systems and forms. The Han and Tang Dynasties mainly used mountains for tombs, while the Song Dynasty practiced a minimalist burial system. The Yuan Dynasty had a hidden burial system with no seals or trees, and the Ming and Qing Dynasties used green bricks for construction. However, all tombs definitely had an entrance, mainly for placing the deceased's body inside. After the burial, the entrance was sealed. The fate of the craftsmen involved was of little consequence."
"For instance, the entrance to Qin Shi Huang's tomb had two heavy doors. After the emperor's coffin was placed inside, the first door was closed. The craftsmen were still inside when the second door was immediately closed, sealing them in the tomb alive."
