Spandau Prison
When Haddad arrives in West Berlin he stakes out the outside of Spandau Prison as a jogger while being spied on. He drafts plans of the outside of the prison including guard towers and entrances. The next day Haddad joins a construction team and sneaks away to get into the prison guard entrance. Carefully eluding the guards by studying their timed patrols he drafts floor plans of the hallways and cell blocks.