This astounding documentary delves into the mysteries of the Tunguska event – one of the largest cosmic disasters in the history of civilisation. At 7.15 am, on 30th June 1908, a giant fireball, as bright the sun, exploded in the sky over Tunguska in central Siberia. Its force was equivalent to twenty million tonnes of TNT, and a thousand times greater than that of the atomic bomb dropped on Hiroshima in 1945. An estimated sixty million trees were felled over an area of over two thousand square kilometres - an area over half the size of Rhode Island. If the explosion had occurred over London or Paris, hundreds of thousands of people would have been killed.

'The Lost Salmon' chronicles the plight and potential recovery of the iconic Spring-run Chinook Salmon of the Pacific Northwest. Faced with extinction in many river systems of the West, a new genetic discovery could aid in their recovery. Once teeming in the millions and a sacrament for the oldest civilizations in the Americas, time is running out for this genetically distinct wild salmon.

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Wildlife cameraman Gordon Buchanan travels to the frozen north, deep inside the Arctic Circle, to meet the ancient Sami people and the animals they hold so close - reindeer.

Two otters, a mother and daughter, are inseparable as the cub faces the dangers of her first Scottish winter, and Mum works hard to ensure both survive. Never more than a few feet apart, cub and mum exhibit a very special relationship as the cub grows up, learning how to fish and fend for herself on the idyllic west coast of Scotland.

Wild rabbits share the sea cliffs on the island of Skomer, off the Pembrokeshire coast, with seabirds like puffins and seagulls. They come in many shades, owing to their intriguing history, and each spring the island of Skomer itself is transformed by wild flowers, creating one of Britain's most beautiful natural spectacles. The green and brown island turns blue and pink for a couple of spectacular weeks under a carpet of bluebells and red campion.

A devoted pair of little owls set up home in an old orchard in rural Herefordshire. From spring blossom to autumn apples, a year in the life of the parent birds, their baby owls and the old fruit trees.

Danusia and her daughter Basia live far away from the modern world, in tune with the rhythm and laws of nature, among animals and the spirits of the dead. The peace and sense of security offered by their enclave come at a price - the women increasingly long for contact with other people. Bucolic is an affectionate observation of people who live in a different way. It evokes a curiosity about their world and a desire to take a closer look.

A genocide survivor transcends overwhelming odds to become a master chimpanzee linguist

A Weaverly Path offers an intimate portrait of Swiss-born tapestry weaver Silvia Heyden. The film captures the inner dialogue and meditations of an extraordinary artist in the moments of creation. Heyden works for over a year to create works inspired by the Eno River in Durham, North Carolina. And she shares how nature, music, her Bauhaus inspired education at the School of the Arts in Zurich and her life experiences anchor and inform her art. Heyden was a 20th century modernist whose body of work redefines the art of modern tapestry.

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The Earth Wins explores the delicate balance between man and Mother Earth, our inter-dependence and the impact of man's actions upon the earth and her inhabitants. With music from Coldplay, The Temper Trap, New Order, indigenous musicians, and commissioned choral pieces, The Earth Wins is a visceral experience celebrating the magnificent diversity of the earth's riches and asking the most important questions of all, "How do we save ourselves from causing the planet's destruction?"

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Eye of the Pangolin is the story of two men on a mission to get all four species of African pangolin on camera for the very first time. As they travel the continent to learn more about those caring for and studying pangolins they are captivated by these strange, secretive creatures and document the race to save them from being poached to extinction. The film was released Endangered Species Day in May 2019 and our goal is to make it the most watched wildlife documentary ever. Therefore we've made it freely available as an open source documentary, accessible for viewing by millions of people around the world via YouTube, through educational establishments and at screenings supported by international conservation organisations everywhere.

Dark fears over the North Pole. Long sheltered from large-scale industrial exploitation, the Arctic is now at risk of becoming the last El Dorado for major oil companies. This, combined with the melting of ice caused by global warming, poses enormous ecological risks: the impact of an oil spill, for example, would be incomparably more serious in this extreme climate than in any other part of the world.

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The summits and sheer mountain ridges of Austria’s "Little Siberia" funnel the freezing air from snow-covered peaks into a gigantic hollow – a high-level plateau at 1,000 metres from which it cannot escape: Lungau is Austria’s coldest region. Creeks and streams start higher here, and create bogs, moors and countless alpine lakes. Summer is short but lively, as eagles rear their precious young and ermines eat their fill before the sparse winter returns, while black alpine salamanders give birth to live miniature versions of themselves beneath the tree-line.

Whales have long been a profound mystery to us. They live in a world so removed from our own that we can barely imagine their lives. Their environment is different, their senses are different, their relationships are different. How might such almost alien creatures see the world?

Takes us to locations all around the US and shows us the heavy toll that modern technology is having on humans and the earth. The visual tone poem contains neither dialogue nor a vocalized narration: its tone is set by the juxtaposition of images and the exceptional music by Philip Glass.