Watch Coast Season 4 in Australia

The south coast of England was the home of movies long before a frame was shot in Hollywood, thanks to long hours of daylight and glamorous London actors holidaying by the sea. Neil Oliver tries his hand at directing his own silent movie. Alice Roberts re-lives the glamour days of the hovercraft and on the Isle of Wight, we go in search of dinosaur footprints which prove the island has been on an epic voyage heading north from tropical climes 135 million years ago.

Castles are an integral part of the history and landscape of Britain, but the art of building a castle was brought across the channel by William the Conqueror. We visit the medieval quarry in France which supplied the stone for iconic buildings such as the Tower of London and Canterbury Cathedral. Nick Crane sets sail from Dover to visit the white cliffs of France. Connected by land before a mega flood carved the channel, Nick discovers that these divided cliffs are facing parallel challenges of coastal erosion.

3,500 years ago, an international demand for Cornish tin put Cornwall at the centre of an internation arms trade. Mixed with copper, Cornish tin made high quality weapons, giving birth to the British Bronze Age. Hermione Cockburn discovers what happened when American media mogul and inspiration for Citizen Kane William Randolph Hearst, made a run-down castle with a sea view into a little hideaway for him and his mistress on the Welsh coast. Neil Oliver visits Porthcawl to trace the history of the Welsh Great Escape.

We visit Cork Harbour, Titanic's last port of call before sailing to disaster, to hear the story of one lucky Irish passenger who had to reluctantly disembark at Cork. Alice Roberts meets Waterford Crystal's chief scientist to learn how to turn the local beach's sand into glass. Hermione Cockburn creates her own mini earthquake on Killiney beach with a mercury dish and some dynamite, recreating an experiment performed 160 years ago that led to the understanding of the earth's tectonic plates.

Blackpool is Britain's most visited seaside destination. How has the resort succeeded when others have gone under? The pleasure park is one of many innovative attractions imported here from America. Neil Oliver views the coast at high speed with a visit to the RAF's world famous "Pilot Factory". As he takes to the skies in a Hawk Jet with an instructor, can he travel from Anglesey to Blackpool and back in just under half an hour?

The Sea Eagles of the island of Canna were hunted to extinction, but now they have been brought back. We climb into one of their nests perched high on a steep cliff to find out what their chances of survival are. Neil Oliver visits Europe's biggest super-quarry to receive an explosive lesson in how the rock is mined. Armed with a simple ruler on a Scottish beach, Nick Crane learns how the challenge of measuring our coastline led to a new branch of maths that could help our mobile phones get smaller.

In Coast's Norwegian odyssey we explore how the Ice Age is still affecting Norwegians today; a collapsing mountainside threatens to thunder down into one of the country's most beautiful fjord's creating a devastating tsunami. Nick Crane visits the little town of Geiranger which sits in the path of the impending tidal wave.

On Holy Island, we find out how a Viking attach inadvertently united the Anglo-Saxon kingdoms, creating a new national identity as they came together to resist a new enemy. Mark Horton navigates to Marine Esplanade in Ravenscar in search of the "town that never was". Destined to be a buzzing Victorian seaside parade, Mark uncovers why it is now just an empty field. Following three unsuccessful attempts to land a boat on Bass Rock, Miranda Krestovnikoff beats Neil Oliver to the challenge and is rewarded with a front row view of the diving gannets.