Simply put, the female spy's hands and feet are fixed, and then her legs are separated and directly straddle a large ice block. When the ice melts, the punishment is over. Compared with any soldering iron, this punishment doesn't sound particularly cruel, but when it is used on female spies, the pain is only known to the victims themselves.
Women's private parts are in direct contact with ice cubes, which will freeze and die after a long time. Under such circumstances, their hands and feet are still fixed, unable to struggle, and can only endure pain. Whether you cry or not is meaningless, because punishment is punishment. In the eyes of prisoners, all your cowardice can be tortured, and the more you torture, the more painful it becomes.
This is similar to the punishment and the earliest Trojan horse, except that it is not so bloody and violent, but like a soft knife, it slowly pushes the willpower and endurance to the limit, and then it is completely destroyed little by little. Once you accept this punishment, people will be completely distracted. No matter what questions you ask, you will tell the truth, and even scream when you see ice.
Whether it is psychological torture or physical torture, the effect of ice punishment is very severe, and this kind of punishment has been learned by other countries and has been changed to make ice punishment more cruel. After entering the era of peace, all punishment and torture were ordered to stop, and such confessions were not allowed. Before, it was not only Dai Li, but also some forms of punishment in gangs.