Pan Zihao walked through the corridor, ignoring the whispers around him. After walking for a while, he glanced around. When he found no one was looking at him anymore, he hid behind a pillar, waiting for the rest of the guards to pass by. When the corridor was empty, he moved and wandered about. His lunch break would go on for an hour.
It took him fifteen minutes to eat. So he could still search about for forty five minutes. The first thing he did was to find the map of the prison. It wasn't difficult to find one.
There was one of the maps available at the staff store room. He entered easily using his staff ID card and studied the map for ten whole minutes. When he was sure he would remember it, he placed it back and walked out.