A beautiful heritage site popular with families was so cash strapped it was rented out as the filming location of a new porno called Tight Rider.
The adult movie is an erotic spoof of 80s classic series Knight Rider staring porn legends Natalli D’Angelo and Mark Sloan.
Shockingly, it was filmed in the tunnels of Amherst Fort, Kent, which was built to help defend Britain’s shores from Napoleon’s rampaging army.
It is described by British Heritage as the most complete Napoleonic fortification in Britain.
The film follows the explicit antics of “America’s finest undercover agent” Michael Tight, who spends his time taking down criminals before having lusting sessions with lovers.
Hilariously he even has a mock version of Kit who talks to the randy secret agent trying to dissuade him from having sex with strangers to help him focus on the mission at hand.
Playboy TV payed £1,200 and spent 10 hours filming in the labyrinth of historic tunnels that run throughout the fort.
But the new film has caused outrage among volunteers and trustees who say it is stopping people from donating vital funds – because they no longer think the fort needs the cash.
Confusion also surrounds who allowed the pervy production crew into the public heritage site – with no-one admitting to giving the go-ahead.
It is has been claimed former chairman of the Fort Amherst Heritage Trust Martin Rogers allowed the film crew in, but he has since resigned from his position.
The filming has been slammed by trustee Matthew Hill, who is now calling on a full investigation to be carried out.
He said: “I think it’s absolutely appalling. There must be far better ways of raising funds through filming rights and I do support a full investigation which I have urged the new chairman to carry out.
“I am aware of one private donor holding back as a result of this.
“Different people have different views, but personally I think if you want to film porn, do it in a warehouse or wherever they do it.
“I would not allow porn to be filmed on Chatham Maritime Trust’s land.
“I would like to stress that I only accepted the post of trustee in the middle of August and only became aware of this filming a few weeks ago.”
The fort – owned by Fort Amherst Heritage Trust – was built in 1755 to protect Chatham Dockyard.
But it never saw combat and was declared obsolete in 1820, although its tunnels were used in the Second World War.
More recently, it has been a widely-loved tourist attraction, described by English Heritage as the most complete Napoleonic fortification in Britain and is a key part of Medway’s World Heritage Site bid.
It is run by volunteers who stage re-enactments and are devoted to retaining a crucial part of Chatham’s history.
Trust chairman Edmund Gulvin released a statement saying: “Fort Amherst confirms that a professional film company in the adult entertainment industry filmed scenes at Fort Amherst during May of this year.
“The contract was handled by a third party location company employed by us and was a private hiring of the Fort.
“The filming was conducted under a closed set policy and there was no public access to the set at any time during the filming.
“We are currently reviewing our procedures for filming as a result of this booking.”
A trailer on Youtube shows Michael Tight tied to a chair by criminals who are ready to kill him – but not before Miss D’Angelo gets “a little piece of him before he dies”.
The film was showing on the Adult Channel this week.
Mr Rogers has declined to comment on the circumstances surrounding his departure.
