New Zealand citizens, particularly young professionals and graduates, are leaving the country in record numbers. Most are heading across the Tasman Sea – known colloquially as "the ditch" - to Australia, lured by better job opportunities and higher wages. However, immigration is also at an all-time high, with migrant arrivals from India the largest group, followed by the Philippines and China. Ruth Evans reports on what lies behind this Kiwi 'brain drain', and asks what the rapidly changing demographics mean for the country's future.

A pioneering summer camp for Ukrainian children with missing parents.

According to the Ukrainian government more than 70 thousand people are missing in the war, leaving families, including thousands of children, anxious for news of their loved ones and unable to move on.

Psychologists say these children are some of the most traumatised they have worked with.

Now for the first time a leading Ukrainian children’s charity is putting on a special summer camp for some of these children, offering them therapy, fun activities and a safe place.

For Assignment, Will Vernon is given exclusive access to this project, where psychologists are developing a new framework to treat these deeply traumatised children.

This episode of The Documentary comes to you from Assignment, investigations and journeys into the heart of global events.

Luke Jerram creates spectacular art installations all over the world. He reached millions of people with his work Play Me, I’m Yours, inviting anyone to make music on the 2,000 pianos he had placed on the streets of more than 70 cities. He has also created large sculptures of the moon, the planet Mars and the sun, which were suspended in spaces like cathedrals so that visitors could admire the celestial bodies up close. Julian May follows the creation of the Jerram's latest work, made for Bradford, this year’s UK City of Culture. A Good Yarn plays on the double meaning of the word “yarn” – both a length of thread and a story. It looks like a giant multi-coloured ball of wool, three metres high, which will be rolled through the city’s streets. Luke Jerram collaborates with Bradford residents to create a kilometre-long rope, made from woollen fabric donated by the public or from second-hand shops. This episode of The Documentary, comes to you from In the Studio, exploring the processes of the world’s most creative people.

Puerto Casado is a remote village in Paraguay, in South America. It’s not dissimilar to many other rural towns in the area: red-brick houses, small grocery stores and unpaved roads. But what makes Puerto Casado an exception is that it’s at the centre of a land dispute between the Paraguayan state, local residents and the Unification Church, a controversial religious group from South Korea. Ronald Avila-Claudio from BBC Mundo has recently been there. Plus, what the re-opening of the border between Ethiopia and Eritrea means to people living there, with Girmay Gebru from BBC News Africa; and a diver swimming with a great white shark and other viral stories, with BBC Indonesian's Famega Syavira Putri.

This episode of The Documentary comes to you from The Fifth Floor, the show at the heart of global storytelling, with BBC journalists from all around the world. This is an EcoAudio certified production.

(Photo: Faranak Amidi. Credit: Tricia Yourkevich.)

Israel faces growing international isolation over the shocking images of starvation in Gaza. Although Israel says there are no restrictions on aid deliveries – which it co-ordinates – or any starvation, charities warn the aid being allowed in is only a fraction of what is needed. The BBC is banned by Israel from reporting in Gaza but, in our conversations, doctors and journalists in the territory tell us how shortages of food, water and medical supplies are affecting them and their families. “We are not the same, this is not our shape, this is not our appearance,” Ghada, a journalist working in Gaza City tell us. We also hear from a medical student who shares her experiences of a typical day in Gaza and her hopes for the future.

Bergen-Belsen Concentration Camp in Germany was the only camp liberated by the British Forces in April, 1945. Prior to that, over 50,000 people were murdered there. After liberation, the British Forces, alongside the American Jewish Joint Distribution Committee (AJDC) set up another camp about 2km away, the Bergen-Belsen Displaced Persons (DP) Camp, the largest DP camp in Europe, where over 2,000 babies were born. Known as ‘Bergen-Belsen Babies’, Susan Schwartz and Karen Lasky were two of the many born there and still hold the label ‘stateless’ after their families were eventually accepted and immigrated to Canada. On the 80th anniversary of the liberation, survivors and Bergen-Belsen Babies gather for the week, trying to fill in the gaps of what happened to their families and reflect on their childhoods. This episode of The Documentary, comes to you from Heart and Soul, exploring personal approaches to spirituality from around the world.

Could AI cure cancer using nature's DNA? A London tech firm, Basecamp Research, harvests genetic information from organisms and microbes around the world. Its genome database - the world's biggest - will help supercomputers to create new products, from detergents to medicines. It's a bewildering new frontier, and it comes with big questions: who should own this valuable information? Who should benefit? And what could it unleash?

The JNIM branch of al-Qaeda is one of the world's deadliest jihadist groups. It has firmly planted its flag in the Sahel. Sub-Saharan Africa has emerged as a key battlefront for jihadists: around 50 percent of deaths from terrorism in 2024 were registered in the Sahel region alone, according to the Global Terrorism Index. JNIM is an eclectic yet united coalition, rooted in the tribal desert regions of Mali, Niger, and Burkina Faso. We look into its leaders, its narrative, and its modus operandi, and analyse the complexity of a region beleaguered by military coups, ethnic violence, and climate change.

Contributors: Barry Marston, Jacob Boswall

Until this year Greenland rarely made the international news and probably only the islanders themselves took much time to contemplate their future. But then US President Donald Trump said he wanted to annexe it for its strategic position and mineral wealth. So the question has become a lot more pressing. With a population of just over 55,000, the biggest island in the world has its own parliament, but foreign policy is controlled by Denmark, something many residents are unhappy about.

Denmark subsidises Greenland to the tune of around $10 000 per person per year. On an island where fishing is the primary source of income, independence would mean either increasing tourism or allowing the mining of minerals like rare earth metals. However the islanders have always favoured strict environmental controls when it comes to mining and it’s expensive for tourists. Hedi Nermin Aziz travels from Denmark to Greenland and talks to politicians, musicians and influencers about Greenland’s Innuit identity and to find out if it can and should go it alone.

This episode of The Documentary comes to you from Assignment, investigations and journeys into the heart of global events.

Bangladeshi architect Marina Tabassum won the commission to create the 25th Serpentine Pavilion – a temporary summer structure for London’s Kensington Gardens. A meeting place in the Royal Parks, A Capsule in Time will also be used for literary and musical events. The arched wooden structure’s translucent panels allow dappled light through, like the South Asian Shamiyana awnings which inspired Tabassum’s design. Marina talks to Erika Wright about how she wanted make a space for the diverse people who use the parks in the summer. This episode of The Documentary, comes to you from In the Studio, exploring the processes of the world’s most creative people.