Suppose in the movie 'The Shawshank Redemption', Andy Dufresne, a banker who is wrongfully convicted of murder, befriends fellow inmate Red and uses his skills to help the corrupt warden. The film ends with Andy escaping from Shawshank prison through a tunnel he dug over years, revealing the corruption within the system.
Can we infer that 'The warden knew about Andy's escape plan'? Yes, no, or maybe?