..........It also mentioned that Hefner had secret passages installed throughout the mansion.
Documents show plans to connect the Playboy Mansion to a series of movie star homes, including Jack Nicholson’s, via secret tunnels
https://www.telegraph.co.uk/culture/film/film-news/11505950/playboy-mansion-jack-nicholson-secret-tunnels.html
https://duckduckgo.com/?q=tunnels+to+the+playboy+mansion&t=ffsb&ia=web
They sure love tunnels.