Introduction to the process of digging the tomb: The underground palace of King Chu faces south, and the tomb is dug directly into the mountain. The total length from north to south is 117 meters, the width is 13.2 meters, and it is more than 20 meters deep into the mountain, with a total area of ​​851 square meters. The majestic underground palace almost hollows out the mountain. The project is huge and majestic, and is rare in the country.