Inside the Hanoi Hilton, silence was mandatory. But the prisoners found a way to speak right through the walls. Using a simple 5x5 grid called the "Tap Code," American POWs could communicate names, orders, and messages of hope right under the guards' noses. They tapped on pipes, walls, and even swept the floor in code to keep their brotherhood alive. 🇺🇸🇻🇳 You can lock them up, but you can’t shut them up. Follow Katath Cinema History for more stories of survival. | Katath Cinema History