Building a drone to let us see what Africa's most dangerous animals get up to underwater is not as easy as we thought it would be! Watch as we build the first ever Earth Touch submarine camera, then send it off to Botswana's Okavango Delta for a dive with hippos in this episode of Wildlife Documentaries Behind the Scenes.

We’re taking you behind the soundproof doors into the world of Earth Touch’s audio experts as they practise the finicky art of Foley. See exactly what it takes to enhance or recreate nature’s diverse sounds and bring a wildlife documentary to life.