Mag claims that tunnels lead from Playboy Mansion to stars' homes, but is it just a prank?

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Secret Tunnels from Playboy Mansion to Jack Nicholson's House Uncovered

Is Playboy pranking us? Thanks to April Fools' Day, we're not sure what to believe, so you may need to take this story with a grain of salt. Then again, it could be true ... what do you think?

We have a pretty good idea of what went on at the legendary Playboy Mansion, but you may not believe what went on under it, INSIDE EDITION reports.

Playboy magazine reports it has just discovered blueprints for a network of tunnels beneath the mansion that supposedly led to the homes of Jack Nicholson, Warren Beatty, James Caan, and Kirk Douglas!

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Mag claims that tunnels lead from Playboy Mansion to stars' homes, but is it just a prank?
Los Angeles, CA - OCTOBER 25: Hugh Hefner and Crystal Hefner attend Playboy Mansion's Annual Halloween Bash at The Playboy Mansion on October 25, 2014 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for Playboy)
HOLMBY HILLS, CA - MAY 15: Playboy Founder and Editor in Chief Hugh M. Hefner (L) and 2014 Playmate Of The Year Kennedy Summers attend Playboy's 2014 Playmate Of The Year Announcement and Reception at The Playboy Mansion on May 15, 2014 in Holmby Hills, California. (Photo by Mike Windle/Getty Images for Playboy)
LOS ANGELES, CA - JANUARY 16: Cooper Hefner (L) and Hugh Hefner pose with Playmate Bunnies at Playboy's 60th Anniversary special event on January 16, 2014 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for Playboy)
LOS ANGELES, CA - JANUARY 16: Hugh Hefner poses at Playboy's 60th Anniversary special event on January 16, 2014 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for Playboy)
LOS ANGELES, CA - JANUARY 16: Hugh Hefner (C) poses with Playboy Bunnies, Playmate of the Year 2013 Raquel Pomplun (2nd L) and Miss December 2009 Crystal Hefner (2nd R) at Playboy's 60th Anniversary special event on January 16, 2014 in Los Angeles, California. (Photo by Rachel Murray/Getty Images for Playboy)
HOLLYWOOD, CA - JUNE 15: Publisher Hugh Hefner attends a press conference at the 35th Anniversary Playboy Jazz Festival - Day 1 at the Hollywood Bowl on June 15, 2013 in Hollywood, California. (Photo by Rodrigo Vaz/Getty Images)
BEVERLY HILLS, CA - MAY 09: (L-R) Cooper Hefner, Playboy Playmate of the Year Raquel Pomplun, Hugh Hefner and Jaclyn Swedberg attend the 2013 Playmate Of The Year announcement at The Playboy Mansion on May 9, 2013 in Beverly Hills, California. (Photo by Paul Archuleta/FilmMagic)
BEVERLY HILLS, CA - MAY 09: Playboy Founder Hugh Hefner (R) and his wife Playboy Playmate Crystal Hefner (L) attend the 2013 Playmate Of The Year announcement at The Playboy Mansion on May 9, 2013 in Beverly Hills, California. (Photo by Paul Archuleta/FilmMagic)
Playboy magazine founder Hugh Hefner poses for photos at the Playboy Mansion in Los Angeles, Thursday, Nov. 4, 2010. (AP Photo/Jae C. Hong)
** FILE ** In this Feb. 27, 2008 file photo, Bill Cosby, perennial host of the Playboy Jazz Festival , right, and Playboy impresario Hugh Hefner, second from left, join jazz greats Herbie Hancock, left, and Dee Dee Bridgewater a party to announce the lineup of the upcoming 30th annual festival, at the Playboy Mansion in Los Angeles. Hancock and Bridgewater will both perform at the Playboy Jazz Festiv, which spans two days, June 14-15 at the Hollywood Bowl in Los Angeles. (AP Photo/Reed Saxon, file)
Model Anna Berglund, left, Hugh Hefner, center, and model Crystal Harris arrive at the world premiere of the newly restored feature film "An American in Paris" during the opening night of the TCM Classic Film Festival in Los Angeles on Thursday, April 28, 2011. (AP Photo/Dan Steinberg)
Playboy impresario Hugh Hefner and Anna Berglund share a front row center box in a capacity crowd at the 32nd annual Playboy Jazz Festival at the Hollywood Bowl in Los Angeles Saturday, June 12, 2010. (AP Photo/Reed Saxon)
FILE - Hugh Hefner, left, and Crystal Harris arrives at the premiere of "Iron Man 2" at the El Capitan Theatre in Los Angeles in this April 26, 2010 file photo. Hefner says he's gotten engaged again. Hefner said in a Twitter message early Saturday Dec. 24, 2010 that he'd given a ring to girlfriend and Playmate Crystal Harris, saying she burst into tears. (AP Photo/Matt Sayles, File)
Playboy magazine founder Hugh Hefner poses for photos at the Playboy Mansion in Los Angeles, Thursday, Nov. 4, 2010. (AP Photo/Jae C. Hong)
American magazine publisher, founder and Chief Creative Officer of Playboy Enterprises, Hugh Hefner at his home (aka Playboy Mansion) in Beverly Hills, Calif. on Sunday, Oct. 13, 2011. (AP Photo/Kristian Dowling)
American magazine publisher, founder and Chief Creative Officer of Playboy Enterprises, Hugh Hefner at his home (aka Playboy Mansion) in Beverly Hills, Calif. on Sunday, Oct. 13, 2011. (AP Photo/Kristian Dowling)
Hugh Hefner, left, and model Crystal Harris at a party celebrating the release of the book "Hugh Hefner's Playboy" a limited edition anthology by Taschen in Beverly Hills, Calif. on Thursday, Dec. 10, 2009. (AP Photo/Dan Steinberg)
Hugh Hefner, second from right, arrives with twins Kristina and Karissa Shannon, left, and Crystal Harris at the 2009 Fox Reality Channel Really Awards in Los Angeles, Tuesday, Oct. 13, 2009. (AP Photo/Chris Pizzello)
Identical twins Karissa and Kristina Shannon, Hugh Hefner, second from right, and Crystal Harris, right, arrive at the taping of the American Film Institute Life Achievement Awards honoring actor Michael Douglas in Culver City, Calif. on Thursday, June 11, 2009. (AP Photo/Matt Sayles)
** EDS NOTE: GRAPHIC CONTENT ** Security guards escort a striker out of the stage as tv host Paolo Bonolis, left, and Hugh Hefner, founder and Chief Creative Officer of Playboy Enterprises, look on during the "Festival di Sanremo" Italian song contest, in San Remo, Italy, Friday, Feb. 20, 2009. (AP Photo/Alberto Pellaschiar)
From left, Bridget Marquardt, Hugh Hefner, Holly Madison, and Kendra Wilkinson arrive at the American Film Institute Life Achievement Award dinner honoring Warren Beatty in Los Angeles on Thursday, June 12, 2008. (AP Photo/Matt Sayles)
55th Anniversary Playmate Dasha Astafieva, of Ukraine, right, poses with Hugh Hefner at the Playboy Mansion in Los Angeles on Friday, Dec. 5, 2008. Astafieva is featured in Playboy's 55th Anniversary issue which will be released on Dec. 12, 2008. (AP Photo/Matt Sayles)
Hugh Hefner, second from the left, and others sit in a in a luxury suite as they attend an NBA basketball game between the Los Angeles Lakers and the New Orleans Hornets in Los Angeles on Tuesday, Jan. 6, 2009. (AP Photo/Danny Moloshok)
Creator and publisher of Playboy magazine Hugh Hefner with guests (left to right) Kendra Wilkinson, Bridget Marquardt and Holly Madison from " The Girls Next Door" arrive at the Spike TV "Guys Choice" award show in Los Angeles, Friday, May 30, 2008. (AP Photo/Gus Ruelas)
Hugh Hefner, left, and Holly Madison are seen during the Playmate of the Year luncheon at the Playboy Mansion in Los Angeles on Thursday, May 8, 2008. (AP Photo/Matt Sayles)
Hugh Hefner with girlfriends Kendra Wilkinson, Bridget Marquardt and Holly Madison arrive for the 134th Kentucky Derby Saturday, May 3, 2008, at Churchill Downs in Louisville, Ky. (AP Photo/David Harpe)
Hugh Hefner, leftt, watches as Playboy's 2008 Playmate of the Year Jayde Nicole, of Canada, speaks on stage during the Playmate of the Year luncheon at the Playboy Mansion in Los Angeles on Thursday, May 8, 2008. (AP Photo/Matt Sayles)
Playboy publisher Hugh Hefner arrives as the Boston Celtics play the Los Angeles Lakers in the first half of Game 3 of the NBA basketball finals Tuesday, June 10, 2008, in Los Angeles. (AP Photo/Kevork Djansezian)
Hugh Hefner poses with Bridget Marquardt, left, Kendra Wilkinson and Sara Jean Underwood during Game 3 of the NBA basketball finals Tuesday, June 10, 2008, in Los Angeles. (AP Photo/Mark J. Terrill)
** EDS NOTE NUDITY ** Hugh Hefner answers questions during a casting session at the Playboy Mansion in Los Angeles, Thursday, Jan. 17, 2008. On Jan. 16, 2008, Playboy launched a multi-city tour in search of a 55th Anniversary Playmate, who will appear in the magazineÕs January 2009 issue. (AP Photo/Matt Sayles)
Hugh Hefner, right, poses for a portrait during a casting session at the Playboy Mansion in Los Angeles, Thursday, Jan. 17, 2008. On Jan. 16, Playboy launched a multi-city tour in search of a 55th Anniversary Playmate, who will appear in the magazine's January 2009 issue. (AP Photo/Matt Sayles)
(L-R) Holly Madison, Hugh Hefner, Bridget Marquardt, and Kendra Wilkinson arrive at the American Film Institute Life Achievement Award event honoring Al Pacino in Los Angeles on Thursday, June 7, 2007. (AP Photo/Matt Sayles)
**FILE** Playboy impresario Hugh Hefner poses with Sara Jean Underwood, Playboy's Playmate of the Year for 2007, at the Playboy Mansion in Los Angeles Thursday, May 3, 2007. (AP Photo/Reed Saxon, File)
Sara Jean Underwood, Playboy's Playmate of the Year for 2007, joins Playboy impresario Hugh Hefner at the Playboy Mansion in Los Angeles Thursday, May 3, 2007. "I thought I was going to puke," she told The Associated Press. "I thought I was going to faint. I thought I was going to cry. It was every emotion you can imagine one would feel when given such an honor." (AP Photo/Reed Saxon)
Jay Leno, left, Hugh Hefner and Holly Madison pose for photographs at the 80th birthday "Sahl-ute" to comic Mort Sahl, Thursday, June 28, 2007, in Los Angeles. (AP Photo/Ann Johansson)
In this photo released by Playboy, Playboy founder Hugh Hefner poses with producer Brian Grazer during Playboy's annual Halloween party on Saturday, Oct. 27, 2007, in Los Angeles. (AP Photo/James Trevenen, Playboy)
In this photo released by Playboy, from left, Kendra Wilkinson, Bridget Marquardt, Playboy founder Hugh Hefner, and Holly Madison pose together during Playboy's annual Halloween party on Saturday, Oct. 27, 2007, in Los Angeles. (AP Photo/James Trevenen, Playboy)
Hugh Hefner poses at the Playboy Mansion in Los Angeles on Thursday April 5,2007. Hugh Hefner's Playboy will offer three upcoming Smith tributes: a 10-page pictorial in the magazine's May issue, an hour long retrospective on the Playboy Channel and an online memorial on Playboy.com. (AP Photo/Damian Dovarganes)
From left to right, Playboy Models Kendra Wilkinson, Holly Madison, Playboy Founder Hugh Hefner, and Playboy Model Bridget Marquardt, react to the "Catacombs" at the Playboy Mansion Haunted House in Los Angeles, Calif. on Friday, Oct. 27, 2006. (AP Photo/Dan Steinberg)
Playboy magazine founder Hugh Hefner, second right, holds a birthday cake with girlfriends Kendra Wilkinson, left, Bridget Marquardt, second left and Holly Madison, right, during a photocall to celebrate his 80th birthday at the 59th International film festival in Cannes, southern France Thursday, May 25, 2006. (AP Photo/Francois Mori)
Playboy Founder Hugh Hefner poses in front of the Playboy Mansion Haunted House in Los Angeles, Calif. on Friday, Oct. 27, 2006. (AP Photo/Dan Steinberg)
Playboy founder Hugh Hefner, second from right, arrives with his three girlfriends to watch auto racing at the Grand Prix of Long Beach in Long Beach, Calif., Sunday, April 9, 2006. Hefner turned 80-years-old Sunday. From left to right, are: Kendra Wilkinson, Holly Madison, Hefner and Bridget Marquardt. (AP Photo/Matt Sayles)
Playboy magazine founder Hugh Hefner, left, answers questions during a news conference at Walt Disney World in Lake Buena Vista, Fla., Thursday, Feb. 3, 2005. Shown here with Hefner are Holly Madison, center, and Kendra Wilkinson, right. After the visit to Walt Disney World, Hefner and his entourage are to head to Jacksonville, were he's throwing his legendary Playboy Super Bowl party. (AP Photo/Phelan M. Ebenhack)
Playboy Enterprises impresario Hugh Hefner poses next to a laser-generated image of his head on a computer screen following a laser scanning session, Tuesday afternoon, Sept. 26, 2000, at the Playboy Mansion in Los Angeles, Calif. The resulting image will be used to create an exact wax model of his head for a figure at the Hollywood Wax Museum. The technology, used here for the first time for a wax figure, is the same type used in the creation of high-tech maps and in the manufacture of mechanical parts for jets and automobiles. The completed figure will be unveiled in Hollywood in November. (AP Photo/Reed Saxon)
Hugh Hefner, founder of Playboy magazine, left, chats with a Playboy playmate as they attend the Los Angeles Dodgers' and Cincinnati Reds' baseball game at Dodger Stadium Thursday, Aug. 2, 2001, in Los Angeles. (AP Photo/Kevork Djansezian)
New York Friars Club Roasts Playboy founder Hugh Hefner at the New York Hilton Hotel in N ew York City. 9/29/2001. Pictured: Ice-T, Kylie Bax and Hugh Hefner. Photo: Evan Agostini/ImageDirect
BEVERLY HILLS, CA - SEPTEMBER 12: ***EXCLUSIVE*** (L to R) Publisher Hugh Hefner (C) poses with Playboy models Holy Madison (L) and Tiffany Holiday during Tiffany's birthday party at Koi restaurant September 12, 2002 in Beverly Hills, California. (Photo by David Klein/Getty Images)
Hugh Hefner and Gene Simmons at the Gene Simmons' 'Tongue Magazine' release party at Barfly in West Hollywood, Ca. Tuesday, June 11, 2002. Photo by Kevin Winter/ImageDirect. *** Exclusive*****
400796 01: Playboy founder Hugh Hefner (C) poses with his playmates outside Las Palmas club February 6, 2002 in West Hollywood, CA. (Photo by David Klein/Getty Images)
397548 05: Playboy founder Hugh Hefner poses with his Playmates at Joya club November 17, 2001 in Beverly Hills, CA. (Photo by David Klein/Getty Images)
BEVERLY HILLS, CA - SEPTEMBER 12: ***EXCLUSIVE*** Publisher Hugh Hefner poses with Playboy models Tiffany Holiday and Summer Altice during Tiffany Holiday's birthday party at Koi restaurant September 12, 2002 in Beverly Hills, California. (Photo by David Klein/Getty Images)
401246 11: Playboy founder Hugh Hefner (C) poses with his playmates during the 'Swank' show presented by Fetish Ball at El Rey Theater February 17, 2002 in Los Angeles, CA. (Photo by David Klein/Getty Images)
Victoria Silvstedt, former Miss Sweden, poses with Playboy Editor in Chief Hugh Hefner for a photograph Thursday, May 1, 1997 at the Playboy Mansion in Los Angeles. Silvstedt is Playboy's Magazine's Playmate of the Year for 1997. (AP Photo/Damian Dovarganes)
Playboy founder Hugh Hefner, center, rings the closing bell at the New York Stock Exchange, Thursday, April 13, 2000. Joining Hefner on the podium is NYSE Chairman Richard A. Grasso, left, "The Bentley Twins, " and William R. Johnston, president and chief operating officer. (AP Photo/NYSE, Mel Nudelman)
Playboy magazine founder Hugh Hefner laughs with reporters before a ceremony Tuesday, April 11, 2000, honoring Hefner with a street sign on Chicago's near North Side. The honorary street sign came under fire by the City Council who rejected the proposal Monday but the decision was reversed during a meeting the council's finance committee Tuesday. Hefner his flanked by his twin girlfriends Mandy, left, and Sandy Bentley. (AP Photo/Charles Bennett)
Hugh Hefner relaxes in red satin pajamas with the first copy of Playboy magazine in his Holmby Hills estate in Los Angeles recently. Hefner turns 70-years-old Tuesday, April 9, 1996. The first magazine in 1953 featured a nude Marilyn Monroe. (AP Photo/Playboy, Elayne Lodge)
Playboy founder Hugh Hefner shown Oct. 11, 1977. (AP Photo/Carlos Rene Perez)
Hugh Hefner, 51, the man who in 1954 took $3,600, started a magazine called Playboy and turned it into an entertainment empire worth, by his estimate, around $200 million, talks about his coming late night TV show, Playboys Playmate Party, May 7, 1977, Los Angeles, Calif. The show is a 90-minute house party taped at his million dollar mansion last month and will be aired on Thursday on ABC. Among other things, it will tell the nation which of his centerfold ladies will be chosen Playmate of the Year. (AP Photo/George Brich)
Publisher Hugh Hefner, right, and companion Barbi Benton shown after their arrival of the Playboy jet at Hollywood-Burbank airport, March 17, 1970, Los Angeles, Calif. (AP Photo/George Brich)
Playboy philosopher Hugh Hefner says his 200 million dollar empire is setting down after a flamboyant youth and a tumultuous adolescence, Nov. 16, 1977. (AP Photo/Carlos Rene Perez)
Playboy Bunnies welcome Hugh Hefner on the inaugural flight of his new DC-9 jetliner, The Big Bunny, March 17, 1970. The women are unidentified. (AP Photo/George Brich)
Hugh Hefner, publisher of playboy magazine shown in 1970. (AP Photo)
Hugh Hefner, left, and girlfriend Barbi Benton, center, are served by N.Y. Playboy Club Bunny Cheri upon arrival at La Guardia aboard the Big Bunny, Heffners personal 5½ million dollar DC-9 jet, March 1970, New York. Hefner is in New York for two days of business conferences and personal appearances in connection with his far-flung Playboy Empire. (AP Photo)
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Now, dig this, a photo from the late seventies allegedly shows an excavation in progress beneath the mansion!

And one shows the newly-discovered tunnel plans, check out the bunny logo on the plywood wall!

In the blueprint, it says the tunnels lead to James Caan's house, Nicholson's home, one to Douglas', while and another one goes all the way to Warren Beatty's house!

Former Playboy bunny Izabella St. James dated Playboy founder Hugh Hefner and wrote the book Bunny Tales: Behind Closed Doors at the Playboy Mansion.

She told INSIDE EDITION, "I think there may be some truth to it. I heard something about tunnels when I lived there one time. I always thought it was Playboy folklore, urban legend."

One Playboy source is saying the tunnels were closed up in 1989.

None of the four actors named has commented on the story. Back in the day, all four actors were known to frequently visit the Playboy mansion.

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