Journalist Raphael Rowe has visited some very scary jails, rubbing shoulders with armed prisoners and gang members.
Now he’s back with a fourth series of the Netflix documentary Inside the World’s Toughest Prisons.
Previously Rowe has gone to jails in countries including Colombia, Ukraine and Papua New Guinea, spending time with both prisoners and guards.
So far 12 episodes have been made across three series, and all of these are available on Netflix. Series one was fronted by journalist Paul Connolly, with Rowe taking over from season two.
So, what do we know about the upcoming series, and when does it drop on Netflix?
Season four of Inside the World’s Toughest Prisons is due to land on Netflix in the UK at 8am on Wednesday July 29.
As with other series, all episodes are expected to be released simultaneously.
Speaking to Cape Talk radio station in South Africa, Rowe said: “It’s drawing out the realities of life inside prisons for people – which they are before they are prisoners – and how the system treats these prisoners and how they run these regimes. “
Each episode focuses on a new prison.
Series four will feature jails in Europe, Africa and South America.
A teaser released on Twitter of the episode filmed on the east African island nation said: “Melrose Maximum Security Prison, Mauritius – one of Africa’s most ruthless prisons.
“Home to some of the country’s worst criminals, living in fear of an extreme new regime which enforces harsh punishments to prisoners for the smallest infringement of the rules.”
In Germany Rowe will visit Schwalmstadt Maximum Security Prison, “where a radical therapeutic approach is being used to transform the country’s most dangerous murderers and rapists into men you’d be happy to live next door to”.
He will also go to Tacumbu prison in Paraguay.
Presenter Raphael Rowe is a journalist who spent 12 years in prison for murder and a series of robberies, before having his conviction overturned.
He was convicted as part of a group called the M25 Three, jailed for a series of attacks near the orbital motorway on one night in December 1988.
They were accused of murdering hairdresser Peter Hurburgh, who was dragged from his car at gunpoint, tied up and beaten, which led to him having a fatal heart attack.
Later on that night, three men balaclavas went on a crime spree with a machete and a gun. Another victim after three men broke into his father’s house and stabbed him during a struggle.
In July 2000 the Court of Appeal quashed their wrongful convictions after it was revealed crucial evidence was withheld at the original trial.
It also emerged that a jury member had visited some key locations. All three men also said that three black men were arrested despite four of the six robbery victims referring to at least one white offender in police statements.
Rowe studied journalism while in prison, and since having his wrongful conviction overturned, he’s worked on Panorama and the Today programme.
Speaking about the series, Rowe said: “After spending 12 years in prison for crimes I didn’t commit, the last thing you’d think I’d want to do is to go back willingly.
“I made a decision to do this [show], because I thought it was important… It is a challenge, but I can walk out anytime I choose.
“I go into these maximum-security prisons and I am treated like a prisoner, by the prison staff and the prisoners… for the seven days that I’m in those prisons.”