Prison Break

We are in East Berlin in the GDR in the 1960s. You are wrongly suspected by the Stasi of spying for the West. Since there is no proof of your innocence, you have to go to prison for an indefinite period of time. But you are very lucky, there were prisoners in this prison before you who were in the same situation as you, who managed to break out. They left clues for innocent prisoners and hid them from the guards so they wouldn't find them. If you are truly innocent, you will be able to find and understand the clues. In an hour the guard will change the guard. Each guard checks the cells before the shift begins. So you have exactly 60 minutes to interpret the clues correctly and escape from prison. As was customary at the time, the prisoners were separated. You will be placed in two separate cells.