This is a CBC podcast.

He just always had a laptop in his face, always.

So I'm like, what the hell are you doing?

He told me about a forum he'd created.

From CBC Podcasts and the Norwegian newspaper, VG, an international investigation years in the making.

Right on Christmas 2012, I started building a system that would monitor these different forums for newly posted images.

How do you take down a criminal network hidden in the shadows?

Finally, they ask me why I'm here. I tell them that I know that they're the ones who are running

the largest child abuse website on the darknet.

The journalists working to expose the darkest corners of the internet.

All we know is that it's growing, it's exploding, and it's a volcano of abuse that's out there.

The police who hunt down online predators.

Law enforcement are trying to catch as many of those abuses as they can and

identify as many as the victims as possible. The lengths they'll go to.

This is just sort of one loud bang, then all I could hear were dogs barking and people just

screaming in terror.

And the lines they're willing to cross.

Here's one question back to you. Did we create the environment that they're willing to cross. Here's one question back to you.

Did we create the environment that they're using?

No, we didn't.

We didn't make it.

They made it.

...