A former detective believes there are dozens more victims of rapist Reynhard Sinaga yet to be found.
The 38-year-old, who was convicted of sexually assaulting 48 men in Manchester, filmed his attacks and kept the footage as 'trophies'.
In January 2020, he was sentenced to a minimum of 30 years in prison, which was extended to 40 years in December last year following an appeal.
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At the time,155 men contacted Greater Manchester Police (GMP), with 23 further victims identified.
According to the police, the total number of victims is believed to be 206, of which 60 are yet to be identified.
But speaking to LADbible, DC Dorothy Orr, who was a key member of the investigation team, says this is just the tip of the iceberg, and that there are many more victims who have yet to come forward.
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"There's a lot. I think there's more than 60," she tells us. "There are 60 that we know of, but I strongly believe we don't have every video.
"I believe that he had devices that he got rid of, so there would have been videos that he got rid of.
"To give you an example, within the CCTV that we were able to get of his block, the 30 days' worth, we have videos of him coming in with people, clearly who are drunk and are clearly going to be a victim, but there's no actual video of the offence.
"So we only know of the ones he actually recorded. We will never know how many didn't get recorded but who he still offended against.
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"So I think there's a lot more than 60."
She then added: "We will never find them all."
This comes ahead of the gripping documentary Catching a Predator, which airs on BBC Two at 9pm tonight (6 October) and will include testimonies from the detectives involved in the case as well as one of Sinaga's victims.
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Daniel is the first survivor to have waived their right to anonymity. He had been out celebrating a friend's birthday in 2015 when he blacked out and woke up in Sinaga's flat.
Speaking in the documentary about seeing the video of him, he says: "It's just horrible to see yourself that vulnerable on photos that someone else has taken.
"You can see that I'm comatose. It's horrible to see. I look dead."
He now hopes his bravery will encourage more survivors to come forward.
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"Some people say 'I'd rather of not known', but that's not me," he says.
"Unknown was harder than not knowing. Even though knowing is horrible."
Over the course of several years, Sinaga attacked countless unsuspecting men, inviting them back to his flat on Princess Street, Manchester, and drugging them.
He would then, invariably, film himself raping them, before stealing their passports or driving licenses, keeping them as 'trophies' of his horrific crimes.
The new doc includes exclusive access to the GMP, which conducted a lengthy investigation into Sinaga following a reported attack from one of his victims in June 2017.
The young man woke in Sinaga's flat to find him on top of him, attempting to rape him.
He had to fight his way out of the apartment, beating Sinaga to a pulp before calling the police.
When officers arrived at the scene, Sinaga was 'barely conscious' and was lying in a pool of blood, having suffered several facial fractures.
Sinaga was later arrested at his hospital bed after attempting to prevent DI Matt Gregory from accessing his mobile phone, on which it was later found Sinaga had been storing hundreds of videos of assaults.
Alex Feis-Bryce, the CEO of Survivors UK, which is a charity for men who have experienced sexual abuse, said we're are only just starting to understand the scale of sexual violence carried out against men.
"I still don't think people realise the prevalence of sexual violence by men and boys," he tells us.
"Recovery from trauma is a lifelong journey. There's evidence that survivors often have trouble with relationships and intimacy, and holding down jobs - there's lots of issues that affect survivors because of the trauma."
And Alex believes that it's vital people like Daniel have the space to come forward and speak out.
He said: "My message would be that you can retain control.
"If you have any doubts about wanting to tell people, organisations like Survivors Manchester and Survivors UK will let you take it at your own pace.
"You won't have to go through the criminal justice system, you don't have to have counselling, you don't have to tell many people, but sometimes telling someone can make a huge difference.
"And while it might not seem like it, there is support available."
GMP is also urging anyone who believes they could have been a victim of Sinaga's or may have any information about his crimes to come forward.
If you wish to contact the police with any information, it can be passed on via the Major Incident Public Portal https://mipp.police.uk/operation/06GMP19V24-PO2.
While anyone who wishes to seek support but does not want to talk to police, St Mary's Sexual Assault Referral Centre can continue to be reached on 0161 276 6515 24 hours a day.
Survivors Manchester can also be contacted on 0161 236 2182.
Topics: Police, TV and Film, BBC, crime, Documentary, Prison