And it's there that the enormity of what Steve's seen happening to the children in the pictures finally sinks in.

It was just one of those moments in the whole McCall investigation where it probably...

I don't know if he hit me then and then hit me afterwards as well because I think walking into the actual room where I'd seen these things take place and at the time, you know, you're very on point and taking photographs and matching it with what I've got and what I've seen just from a statement.

But I think that was during the whole investigation that, you know, I got home and I was pretty upset.

It's probably the only time I cried during the whole matter where it just really hit home.

What were their reactions?

Varied, um...

Some broke down, obviously.

He's being charged with crimes against seven different children.

..from this investigation.

I'm just going to let you know you're under arrest in relation to seven counts of an awful sexual intercourse with a child believed to be under the age of seven years of age.

You're also under arrest in relation to the production, dissemination and possession of child pornography.

I'll ask you, who is it you actually work for at the moment? Families SA.

Yeah, OK.

The Argos team will be listening back to this recording to gather any information they can to help them impersonate Skii.

This is the first time these interviews have ever been heard beyond a small circle of law enforcement agents.