Playboy had plans to build secret tunnels to nearby celebrity homes

Screen grab

A screen grab from a blueprint found by Playboy editorial staff.

According to the article, when asked about the photos of the construction site the new Playboy Mansion general manager reportedly said, "that's probably when they built the tunnels in the 70s."

Screen grab

A screen grab from a blueprint found by Playboy editorial staff.

A closer look at the blueprint shows that there were plans to dig tunnels to the the homes of "Mr J. Nicholson," "Mr W. Beatty," "Mr K. Douglas," and "Mr J. Caan."

Screen grab

Screen grab of a Polaroid picture of a construction site at the Playboy Mansion.

"We'll go ahead and assume they're talking about Jack Nicholson, Warren Beatty, Kirk Douglas and James Caan - all of whom lived near the Playboy Mansion during the late 1970s and early 1980s," Playboy reported.

According to the article, the partial tunnels were closed up in 1989 when Hugh Hefner married then-Playmate Kimberley Conrad.

Playboy reached out to the publicity representatives for Nicholson, Caan, Douglas, and Beatty, and has yet to receive a comment.

Here's a closer look at the blueprints:

Screen grab/Amanda Macias/Business Insider

Screen grab/Amanda Macias/Business Insider

And here's a recent look at the Playboy Mansion:

REUTERS/Kevork Djansezian

Kennedy Summers, 27, the 2014 Playboy Playmate of the Year, poses next to a Mini John Cooper Works Roadster at the Playboy Mansion in Los Angeles, California May 15, 2014.