5. Buried hard drives

Pete and Greg have learnt about a paedophile calling himself “Twinkle”, who runs a website dedicated to sharing images of very young children.

At first, they have no idea who he is or where he could be, but slowly Twinkle gives himself away. Working with investigators in Brazil and Portugal the agents discover that Twinkle is a young man living in rural Portugal. Greg flies out to assist with the arrest and discovers some very disturbing scenes.

This episode talks about child sexual abuse from the very start, and includes some upsetting scenes.

For further information on the issues raised in the programme, contact support organisations in your own country. For a list of organisations in the UK that can provide support go to bbc.co.uk/actionline.

Reporter and Presenter: Sam Piranty

Writer and Producer: Annabel Deas

Script advice: Matt Willis

Sound design: Neil Churchill

Composer: Rob Lewis

Executive Producer: Rebecca Henschke

Commissioning Senior Producer: Sarah Green

Commissioning Editor: Jon Manel

The Darkest Web is a BBC Eye production for the BBC World Service.