VIDEOS found inside one of Madeleine McCann prime suspect Christian B's "secret lairs" could hold vital clues about her disappearance.
German police have reportedly discovered thousands of videos on hard-drives and USB drives buried at a property owned by the convicted sex offender.
Australian TV show 60 Minutes reports cops believe the clips could provide a much-needed breakthrough in the 13-year-old case.
It is unclear what the content of the videos is and how they may be linked to Madeleine's disappearance.
The show – slated for broadcast tonight in Australia – promises to offer new evidence about the case and a look insidethe sex offender's "secret lair".
Aerial footage shown in the trailer includes two rundown buildings in a wooded area, along with a look inside a room strewn with rubbis.
The location of these buildings is unclear – but Christian B is known to have owned properties in Germany and Portugal.
German prosecutor Hans Christian Wolters, who is leading the investigation, also continues to insist that Madeleine is dead.
He said: "We have strong evidence that Madeleine McCain is dead and that our suspect killed her."
However, Met Police investigation Operation Grange remains a missing persons case rather than a murder probe.
Christian B was unveiled for the first time earlier this month as a new prime suspect in the vanishing of the three-year-old in Praia da Luz.
Madeleine is believed to have been snatched from the Ocean Club apartment where she was sleeping alongside her twin siblings while parents Kate and Gerry dined with pals nearby.
The suspect is known to have lived in the hills above Praia da Luz just 11 minutes drive away when the little girl disappeared.
He also had a rundown and dilapidatedshack only two miles away from the McCann's holiday let.
Christian B is believed to have spent time in the Portuguese resort town between 1996 and 2007 – during which he targeted holiday homes to burgle.
The suspect is currently in Kiel prison in Germany after being convicted of raping a 72-year-old woman also in Praia da Luz.
He has been linked to at least two other sex crimes in the town – including the rape of an Irish woman.
Witnesses in his trail said they had seen him "climb through open windows in one or another holiday flat".
The 43-year-old also has at least two previous convictions for sex crimes against young girls.
He is now being linked to a number of other missing children as grim details of his past continue to emerge.
Christian B has been described as a "twisted loner" who is understood to have lived in squalor and made money committing petty crimes.
The sex offender came to the attention of police after he allegedly boasted about snatching Madeleine while sitting in a German bar on the 10th anniversary of her abduction.
Experts said have Christian B matches the profile of a Jimmy Savile-style “paraphiliac”, who targets victims of all ages.
He is ex-lawyer Serafim Vieira has described him as having "'psychopathic traits" and admitted he could be responsible for Madeleine's abduction.
However, a series of bungles in the police investigation have cast doubt over whether prosecutors can secure a conviction.
Madeleine vanished on May 3, 2007, while on holiday with her parents Kate and Gerry and siblings Sean and Amelie.
The couple were having dinner with pals just a one minute walk away when the tot vanished – with Kate discovering her daughter was missing just after 10pm.
The mum and dad – both doctors – have since poured their into efforts finding her and have never given up hope that Madeleine may be alive.
Madeleine would have turned 17 last month, and the family have described the identification of Christian B as "potentially very significant".
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