Hands up if you came here with a people smuggler and it was easy to get over the border from Turkey to Bulgaria.

There's a lot of people nodding yes.

And it's easy?

Easy.

No, no, no.

No, no easy.

Turkey is home to more refugees than any other country in the world.

Over three million from the war in Syria and a million more, including those who fled the war in Afghanistan.

To get from Turkey to the European Union, you can go by boat to Greece or by land across mountains and forests and rivers

and sometimes a fearsome-looking razor-wire fence to Bulgaria,

like these men have done, who spoke to me at a refugee camp in Southeast Bulgaria.

So you pay the smugglers, you climb over the fence,

but you don't see the police?

No, no, bolis, no police.

That route is known as the East Mediterranean route,

and back in 2015, millions of people reach Europe this way

to flee conflicts in the Middle East.

Since then, international deals have been struck

and border security toughened across Europe

to stem the flow of migrants.

The European Union has paid billions of euros to Turkey

to stop migrants attempting the journey

...