Introduction to blood pool: The first blood pool in the world was unearthed in Medog County. The blood pool, a mechanism that protects the door from being opened, uses human blood to relax a powerful fiber. In "The Tibetan Code", the blood pool is a kind of mechanism. Its appearance is difficult to accept, because it soaks different human organs (many) in different blood pools. But its preventive properties are very effective, because only putting the correct organ into the correct blood pool will open the mechanism, and it uses the different functions of various organs to produce the liquid needed to open the mechanism, which is the product of human sacrifice. .