Following a successful run with the BBC, he moved to a subject close to home, exploring the humanity among prisoners in a docuseries called Inside the World’s Toughest Prisons for Netflix.

Ciudad Barrios prison in El Salvador, one of the most violent countries in the world, a facility exclusively for members of MS-13 - an international criminal gang - is guarded outside by the army.

A former Barwon inmate told the Herald Sun while crime texts had a way of getting inside, books with stories of local crime figures were among the hardest to smuggle in. “All government prisons ...