You are about to listen to a BBC podcast and I'd like to tell you a bit about what goes into making one.

I'm Sadata Sese, an assistant commissioner of podcasts for BBC Sounds.

I pull a lot of levers to support a diverse range of podcasts on all sorts of subjects,

relationships, identity, comedy, even one that mixes poetry, music and inner city life.

So one day I'll be helping host develop their ideas, the next fact-checking, a feature,

and the next looking at how a podcast connects with its audience, and maybe that's you.

So if you like this podcast, check out some others on BBC Sounds.

Before we begin, just to remind you, many of the people we've interviewed for this season of World of Secrets speak Portuguese, so their words are spoken by actors and members of our BBC team.

Yeah. team. Tucked away on a remote stretch of coastline is an old slate roof cottage peering out over the sea.

Half a mile from the nearest road, hidden from view by hills and overlooking a secluded

bay, it's a hard place to find.

That's why it's been chosen, to give shelter from the bitterly cold November night

to a gang of smugglers.

But they're being watched.

It's 1986.

We're in Pembrokeshire, Wales, on one of the most westerly points of the UK.

Around the cottage, hidden in the undergrowth,

as surveillance officers from police and customs.

Using binoculars and night vision equipment,

they're keeping an eye on both the gang and the coastline.

It's a major undertaking involving some hundred officers.

They've been tracking the smugglers for a year,

...