Discovering the Titanic

In 1967 the British withdrawal from their colony of Aden led to the creation of the People's Republic of South Yemen. Britain had colonised the port city in 1839. Aden had been at the centre of the British colonial trading system and had been one of the busiest ports in the world. The handover has been described as one of the most chaotic in British colonial history. Farhana Haider has been speaking to the former British diplomat, Oliver Miles and to Ghassan Luqman who says the scars of Britain's quick withdrawal are still being felt in Yemen today.Photo: Aden 1967 Copyright: Alamy.

5 Joulu 201710min

The four huge granite heads of former presidents on Mount Rushmore have become one of America's most famous monuments. Construction started on the site in 1927, led by sculptor Gutzon Borglum. His granddaughter Robin Borglum Kennedy speaks to Lucy Burns about his work.Picture: Mount Rushmore, June 1995 (KAREN BLEIER/AFP/Getty Images)

4 Joulu 201710min

Thousands of scientists moved to deepest Siberia to dedicate their lives to research. The Soviet authorities began building the city in 1957. Academics were enticed there by the promise of housing and interesting work. Olga Smirnova spoke to Dr Victor Varand who made his life in Akademgorodok, or Academic City.Photo: Scientists at work in Academic City. Credit: Victor Varand.

1 Joulu 20179min

Alexander Litvinenko was a former colonel in the Russian secret service, but fled to London seeking political asylum when he became critical of the Putin government in 2000. In November 2006 he was poisoned with the highly radioactive substance Polonium 210. Rebecca Kesby has been speaking to his wife, Marina, about his life and excruciating death.(PHOTO: Alexander Litvinenko in a London hospital a couple of days before his death in November 2006. Credit Getty Images.)

30 Marras 201710min

In November 2002, an oil tanker, the Prestige, sank off the coast of Galicia in north-west Spain, causing one of the worst environmental disasters in the country's history. In the following months, thousands of people from all over Spain travelled to Galicia to help clean up the spill. Simon Watts talks to Xavier Mulet, one of the volunteers.(Photo: Volunteers cleaning up after the Prestige. Credit: Xavier Mulet)

29 Marras 201710min

Colonel Domingo Monterrosa was one of El Salvador's most successful and ruthless military commanders in the fight against leftist rebels. But in October 1984 the rebels carried out an audacious plan to kill him. Mike Lanchin has spoken to one former rebel and a war correspondent about the man and the plot.(Photo: Colonel Domingo Monterrosa (R), speaking with one of his company commanders, 1983. Credit: Robert Nickelsberg/Getty Images)

28 Marras 201710min

It was one of the most notorious spy cases in US history. On 27th November 1954, former US diplomat Alger Hiss was released after spending four years in jail for allegedly lying about being a Soviet agent. Alger Hiss had been seen as a potential secretary of state, but was unable to shake off allegations that he'd passed official documents to Moscow. His conviction was the prelude to a Communist witch-hunt in America that became known as the McCarthy era. Louise Hidalgo has been talking to Alger Hiss's son Tony Hiss about growing up in the shadow of the scandal, and his belief that his father was innocent.Picture: US state department official, Alger Hiss, denying he was a member of a Communist cell before the House Committee on Un-American Activities in Washington on 28th August 1948. (Credit: William Bond/Keystone/Getty Images)

27 Marras 201710min

East Germany's most famous singer-songwriter was exiled to the West in November 1976, causing an international outcry. Wolf Biermann was stripped of his GDR citizenship while on tour in West Germany.Wolf Biermann speaks to Lucy Burns about his political songs and his fame on both sides of the Berlin Wall.Picture: Keystone/Hulton Archive/Getty Images

24 Marras 20178min