An Australian man will face a Philippines court today to enter a plea on paedophilia charges described by authorities there as "depraved".

Peter Scully allegedly ran an international paedophile ring from Mindanao in the Southern Philippines that raped, tortured and murdered children.

One victim was only 18 months old.

WARNING: This story contains graphic details which may be disturbing for some readers.

Scully first moved to Cagayan de Oro on the island of Mindanao in 2011.

Exploiting the poverty and desperation right on his doorstep, Scully approached Arlene Loyola and offered to give her eight-year-old daughter education and food.

Ms Loyola accepted the offer, but after two weeks she began to worry.

"I prayed and God told me to get her away from Scully and I did," Ms Loyola told 7.30.

When Ms Loyola got her daughter back she had been bashed and badly bruised. Scully had repeatedly drugged and raped the girl.

Ms Loyola blames herself.

"I feel so ashamed and asked forgiveness from my child because she suffered so much," she said, sobbing.

"She just wanted to go to school.

"I can't sleep; I just can't stop thinking about what happened to her."

Customers paid $10,000 to view torture videos

But this was just the tip of the iceberg of Scully's depravity.

Officers of the Philippines Bureau of Investigation showed 7.30 a dark old house with high walls in another part of Cagayan de Oro.

It was here Scully made the videos called The Destruction of Daisy.

He was selling the videos to online customers around the world for up to $10,000 a view.

The full details of what happened at this house are too shocking to reveal.

But Angelito Magno, one of the lead investigators, gave 7.30 an insight.

"In one of these videos was an 18-month-old baby girl who was hanged upside down," he said.

"She was crying all the time, she was being tortured."

Demand was so great for these sickening videos that six other foreigners, mainly from Europe, started to fund Scully.

But one made-to-order video proved to be Scully's undoing.

In it, two girls, one aged 12 and the other 13, were forced to dig their own graves while being raped.

Mr Magno said the girls eventually led them to Scully.

"The two girls were able to escape and seek police assistance while they were still wearing chains, chains to their necks," he said.

Mr Magno was part of the international team that arrested 51-year-old Scully in February, charging him on multiple counts of sexual abuse, cyber sex, torture, rape, human trafficking and murder.

In Manila, an investigation team is gathering all the evidence before the trial formally starts later this year.

They now have seven victims under witness protection who will testify against Scully in court.

Prosecutors confident Scully will go 'away for good'

Eric Nuqui works at the Philippines Investigation Bureau and will be one of the lawyers who will be leading the trial against Scully.

"With the overwhelming evidence we have and with the prosecutors handling the case, we are pretty much sure that we have a very solid case and that he will be away for good," he told 7.30.

The team in Manila and the Australian Federal Police are now working to identify and prosecute Scully's customers around the world.

They have evidence that an Australian man offered Scully about $2,500 to rape a 13-year-old girl.

While the capture of Scully has been a success for the Philippines Bureau of Investigation, the reality is, with limited manpower and resources, they are struggling to cope with the flood of paedophiles entering the Philippines.

The Australian Federal Police say 250 Australians convicted of child sex offences have travelled to the Philippines in the last four years.

But Philippines authorities say they know of only 10.

Mr Nuqui said there was a problem in coordination in the Philippines.

"As far as I'm concerned, I'm yet to receive information," he said.

"Maybe they're providing information to other (Philippines) agencies and we are not able to access it."