British filmmaker Reza Pakravan shares his experiences of recording his new Amazon Prime series, ‘The World’s Most Dangerous Borders.’ Travelling 5000 miles, across eight African countries from Senegal to Somalia via the Sahel, a belt of land just below the Sahara Desert, and one of the most volatile parts of the world. We talk about everything from being arrested in Darfur, to the beauty of The Great Green Wall.