prison is the place where patriots were locked up. The rooms were damp and didn't have a place for bathrooms. So they make small holes for the bathrooms. So it smelled a lot. There is also little hole so they can see inside. But from the inside they can's see other directions but front. And they had buttons to tell the japan guards. If they pushed it on purpose or evan accident the patriots were hit. And if a lot of them stay together and they can's talk so they made a secreat code to talk to each other.