Together with his class, you went to the museum for a tour. Zasmotrevshis one of the exhibits, you got out of the group. When you realized this and decided to catch up with them, the building has already been locked and there was no one inside. In such places there are several emergency exits, so try to find them. Do not pick up too much noise, it can activate the siren. After that once the police arrive and the delay you. Explain to them why you are here, just will not work.