Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service.

On the 40th anniversary of the nuclear disaster at Chernobyl, we hear from one man involved in the clean-up operation.

Our guest is Jordan Dunbar, presenter of the BBC documentary ‘The Last Dance Floor in Chernobyl’.

Next, we hear about the worst floods in 50 years that the Mexican state of Tabasco experienced and the race to save thousands of animals in Paraguay and Brazil in 1982.

Plus, the unexpected drought in the Danube River in 2011 and when Canada saw their largest ever campaign of civil disobedience in 1993 to save a rainforest.

In our episode of Sporting Witness, the tale of the 1981 film ‘Escape to Victory’.

Contributors:

Yurіy Skaletskyy – former radiological officer in Soviet Union military

Jordan Dunbar – BBC presenter

Marco Franco – emergency co-ordinator for the Red Cross in Mexico

Dario Perez Chena – rescue worker in the Mymba Kuera operation

Kristian Yakimov - an ecologist and tourist guide in Bulgaria

Tzeporah Berman – environmental activist in Canada

(Photo: Chernobyl in the aftermath of the explosion in 1986. Credit: SHONE/GAMMA/Gamma-Rapho via Getty Images)

Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service.

This week, the moment when Irish writer Roddy Doyle discovered he'd won one of the most prestigious honours in fiction: The Booker Prize.

And our guest, Merritt Moseley, emeritus professor of English at the University of North Carolina in Asheville, discusses the history of the award.

Plus, we look back at the assassination of radical African leader Thomas Sankara in 1987, and find out more about the Indonesian province that introduced Sharia law.

Also, how Hans Christian Andersen's 'lost fairytale' was discovered in Danish archives, and the female rollerblader who beat the men to grab X Games glory.

Finally, the story behind the creation of the children's playtime favourite, My Little Pony, in 1983.

Contributors:

Roddy Doyle – author of Paddy Clarke Ha Ha Ha.

Merritt Moseley - emeritus professor of English at the University of North Carolina in Asheville.

Paul Sankara – brother of Captain Thomas Sankara.

Bonnie Zacharle – toymaker.

Azwar Abubakar - acting governor of Aceh.

Ejnar Askgaard - curator and senior researcher, Museum Odense.

(Photo: Roddy Doyle with his prize winning book, 1993. Credit: PA Images)

Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service. Our guest is Sahar Saleem, an Egyptian paleoradiologist specialising in using medical imaging technology to study mummies and ancient artefacts.

We start with the story a Jewish interpreter who helped guard Adolf Hitler's teeth in the final days of the Second World War.

Then, the engineering efforts to reduce the tilt of the Leaning Tower of Pisa - which kept it closed to the public for 11 years.

We hear a Nepalese activist recall the massive protests that led to the restoration of multi-party democracy in 1990.

Plus, a childhood memory of the first major surrealist exhibition in New York.

Finally, we hear of the current whereabouts of Jorge, a popular Argentine sea turtle.

Contributors:

Lyubov Summ - granddaughter of interpreter Yelena Rzhevskaya.

Nunziante Squeglia - professor of geotechnics at the University of Pisa.

Durga Thapa - Nepalese activist.

Carroll Janis - performer at the first major surrealist exhibition.

Nicky Salapu - former goalkeeper for American Samoa,

Alejandro Saubidet - Argentine marine biologist.

(Photo: Pisa Leaning Tower and Pisa Cathedral, in the celebrated Piazza dei Miracoli. Credit: Getty)

Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service. Our guest is Dr Sarah Ward, a maritime archaeologist from the Australian National University.

We start with the discovery of the sunken Terra Nova, Scott of the Antartic's ship.

We hear from the Danish food entrepeneur Claus Meyer - a driving force behind New Nordic Cuisine.

Then, the long journey that finally took Picasso's Guernica to Spain.

Plus, the Chinese pharmacist who invented the e-cigarette.

And, the life of Echo the elephant - the star of the world's longest-running study of wild elephants in Kenya.

Finally, "fan man" James Miller and boxing's most bizarre night.

Contributors:

Leighton Rolley - oceanographer.

Dr Sarah Ward - maritime archaeologist from the Australian National University.

Claus Meyer - Danish food entrepeneur.

Ambassador Rafael Fernandez-Quintanilla - Spanish diplomat (from BBC archive).

Hon Lik - inventor of the e-cigarette.

Dr Cynthia Moss - founder of the Amboseli Elephant Research Project.

Marc Ratner - former representative of the Nevada State Athletic Commission.

(Photo: The Terra Nova held up in the pack, Antarctica, 1910. Credit: Herbert Ponting/Royal Geographical Society via Getty Images)