On the coast, two worlds collide. Coasts are the most dynamic and challenging habitats in the ocean - that brings great rewards but also great danger. The extraordinary animals that live here must find ingenious ways to cope with two very different worlds.

While making Blue Planet II, we have explored parts of the ocean that nobody has been to before, encountered extraordinary animals and discovered new insights into how life thrives beneath the waves.

While making Blue Planet II, we have explored parts of the ocean that nobody has been to before, encountered extraordinary animals and discovered new insights into how life thrives beneath the waves.

This extended special of the nature documentary series journeys from the equator to the unexplored depths, meeting the best-loved characters from the series.

This extended special of the nature documentary series journeys from the equator to the unexplored depths, meeting the best-loved characters from the series.

In the first programme of the series, the team uncovers the world of the giants that reside in and on our western seas.

Alan Titchmarsh travels Britain to discover why our islands are so diverse, beautiful and extreme.

From Jurassic Oxford to Scotland's Himalayas, Alan explores the secret history hidden in the rocks beneath our feet. He discovers how Scotland and England drifted together from their original locations, near the Equator and the South Pole, and finds fossils which reveal that the Yorkshire Dales was once a sea with coral reefs.

Alan gets under the skin of the much misunderstood Neanderthal man, examines relics from the past and discovers that an ice sheet covering most of Britain stopped at London's Finchley Road tube station..

Alan ventures 50 metres below the Channel, scales an ancient tree in the New Forest and stalks red deer in Scotland to tell the story of how island Britain was created. He searches for clues across the country, discovering tropical nickar nuts in Scotland, palm trees growing at latitudes where polar bears should feel more at home and watching whooper swans in Cambridgeshire who arrive from Siberia for Britain's milder winters.

In the second of a two-part documentary, David Attenborough explores how much climate change is altering our planet, suggesting ways we can help.

David Attenborough asks three key questions: how and why did Darwin come up with his theory of evolution? Why do we think he was right? And why is it more important now than ever before?

Nick Crane and the team take a fascinating journey around the coast of the United Kingdom, uncovering stories that have made us the island nation we are today.

The nation's love affair with the coast will be reawakened for this entertaining and ambitious exploration of the entire UK coastline. Across 13 programmes Coast celebrates the unique character of the UK's coastal communities, exploring a wealth of fascinating human stories through a mixture of expert comment, contemporary storytelling and computer-generated images. This is the coast as never seen before.

The South Wales coast, by the Second Severn Bridge, has the second highest tidal range in the world, at around 14.5 metres (the highest is the Bay of Fundy, located off the northern coast of Maine, USA). It's also home to an extraordinary tidal phenomenon - the Severn Bore.

The coast of North West England covers some classic industrial landscapes and playgrounds, and a dangerous world of shifting sands.

Scotland's west coast has the most jagged and dramatic coastline in Great Britain. It's only 300 miles as the seagull flies, but once you add in the dozens of islands anchored off this rugged coastline it is thousands of miles.

This is a coast of two halves, divided by the broad Humber. We start on the craggy grandeur of the Yorkshire coast and finish by wading through the vast salt marshes and mudflats of the Wash.

Every beach, bay and cliff edge along this stretch of coast has a story to tell of people who struggled with changing sea levels, the perils of flooding, subsidence and erosion. Whole towns have been lost to the sea, houses teeter on cliff tops... the very land is crumbling away.

In this programme we look back at some of the highlights of our journey, exploring the future of our coast and what it'll mean for us as an island nation.

Helen Czerski goes in search of colour. She reveals what it is, what it does, and why colour doesn't exist outside of our perception.In the first episode, Helen seeks out the colours that turned planet Earth multicoloured. This is an HQ version.

The raw, early Earth had plenty of colour, but that was nothing compared with what was going to come next. That canvas was about to be painted with a vast new palette - and the source of those colours was life. Green is the colour of the natural world and yet it's the one colour that plants have evolved not to use.This is an HQ version.

We can't see in ultra violet, but many animals can. Helen explores what the world looks like to the birds and the bees. With the discovery of x-rays we could look inside ourselves in ways that previously had only been possible after death.This is an HQ version.

Helen Czerski goes in search of colour. She reveals what it is, what it does, and why colour doesn't exist outside of our perception. This is an HQ version.

Astronomer Carl Sagan leads us on an engaging guided tour of the universe, bringing such topics as Einstein\\\'s theory of relativity and Darwin\\\'s theory of evolution down to a layman\\\'s level of understanding. The first episode opens with a description of the cosmos and introduces the iconic \\\'Spaceship of the Imagination\\\'

Series showing how new camera technology is revealing the inner workings of the Earth's most spectacular natural wonders

Andrew Marr explores how Darwin's theory of evolution by natural selection has taken on a life of its own far beyond the world of science

In the first episode of the three-part series, Andrew Marr explores how Darwin\'s theory of evolution by natural selection has taken on a life of its own far beyond the world of science.

Andrew Marr discovers something surprising about his own evolutionary history as this epic series continues with an exploration of Darwin\'s impact on politics and society.

In the final episode of this ground-breaking series about Charles Darwin\'s legacy, Andrew Marr discovers how Darwin\'s ideas are helping us to save ourselves and all life on earth from extinction.