Located beneath Russia's Ural Mountains, Orda Cave is legendary among divers for its unique beauty. The cave's waters are clearest in winter, when the land above lies frozen. With temperatures approaching minus 40 degrees, NHK attempts to film the cave for the first time ever using 4K cameras. Scientists give them insight into the cave's origins, enabling the crew to uncover the miraculous story of how the cave was naturally formed 300 million years ago by climate change and a shifting landscape.

Putin's new law that forbids 'propaganda of non-traditional sexual relations to minors' hits millions of gay/lesbian youngsters in Russia. Parents and friends of gay kids now are obliged to tell them they are sick, sinful and abnormal. These teens have no forum, find no help in Russia, you won't even find them on the internet: Error 404. For the first time, the bravest of them turn to the camera in the new film of 'Winter Go Away'

Moscow, 31 December 1991: the Red Flag of the Kremlin is pulled down and replaced by the three-coloured banner of Russia, marking the end of the Soviet Union and of its ideologies. Illustrated with testimonies of top protagonists and Mikhail Gorbachev himself, the documentary recounts, day by day, the critical last two years that led to the fall of the largest and one of the most totalitarian empires of the 20th century.

From east to west, via mountains, volcanoes, deserts, lakes and Arctic ice, this breathtaking series uses stunning cinematography to chart the dazzling natural wonders of this vast country. Accounting for around 10 per cent of the world’s dry land, Siberia is famous as a brutally cold place. Yet it is home to a diverse range of habitats and animal life – including musk deer, camels, gazelles and the extraordinary Siberian salamander, which can spend years encased in -40°C ice and still survive.

In the third part of his journey into the history of Christianity, Professor Diarmaid MacCulloch charts Orthodoxy's extraordinary fight for survival. After its glory days in the eastern Roman Empire, it stood right in the path of Muslim expansion, suffered betrayal by crusading Catholics, was seized by the Russian tsars and faced near-extinction under Soviet communism. MacCulloch visits the greatest collection of early icons in the Sinai desert, a surviving relic of the iconoclastic crisis in Istanbul and Ivan the Terrible's cathedral in Moscow to discover the secret of Orthodoxy's endurance.

Art critic Andrew Graham-Dixon tells the incredible story of Russian art, its mystery and magnificence and until now a story untold. He explores the origins of the Russian icon from its roots in Byzantium and the first great Russian icon, Our Lady of Vladimir to the masterpieces of the country's most famous icon painter, Andrei Rublev. Both epic and awe-inspiring, and producing brilliant art", nevertheless medieval Russia could be a terrifying place. Criss-crossing the epic landscape, Andrew visits the monastery founded by Ivan the Terrible, where his favourite forms of torture found inspiration in religious art. One man would shine a light into Russia's 'dark' ages - Peter the Great who, surprisingly, took as his inspiration Deptford in South London.