Britain's Secret Seas (2011)

In the first programme of the series, the team uncovers the world of the giants that reside in and on our western seas. A few metres off the Cornish shore, the team study Britain's largest fish, the basking shark. Despite the fact that they grow up to ten metres long, little is known about them, which makes effective conservation very difficult. In an exceptional encounter, the team is surrounded by up to 12 sharks as they feed on microscopic plankton. Their shark expedition then takes them north to the Isle of Man. Working alongside local scientists, they take shark DNA samples using a kitchen scourer in order to assess the genetic health and long-term fitness of these great leviathans. The team also runs into a giant swarm of jellyfish. In the waters of South Wales, Tooni encounters an invading army of giant spiny spider crabs. These creatures boast a leg span of over a metre across, and Tooni reveals that they come into the shallow waters every year to find a mate. On Lundy Isla

May 9, 2011, midnight

In the second programme in the series, explorer Paul Rose, marine biologist Tooni Mahto and maritime journalist Frank Pope explore the wild seas around Scotland. The team travel to Bass Rock, one of the largest gannet colonies in the world. They are there to try and find out why when most British seabird populations are in decline, the northern gannet is bucking the trend. Tooni helps scientists who are using GPS trackers to discover the extraordinary distances gannets can fly in the search for food. Paul goes beneath the waves to witness the amazing diving ability of Britain's largest seabird. Tooni joins a scientist in St Andrews Bay in search of the bottlenose dolphin to find out why dolphins have unique signature whistles - could they be names as we know them? She also takes Paul on a spectacular night dive at St Abbs in search of the amazing sea creatures that fluoresce beyond our visual spectrum. And intriguingly, this discovery has been used to help study cancerous cells. Exp

May 16, 2011, midnight

This time on Britain's Secret Seas, the team set out to explore the waters off our eastern coastline, which are constantly pounded by the raw power of the waves. These are the shallowest waters off our shores but over the centuries they have been some of our most productive, providing oil and gas as well as fish for our tables. But things are changing in the North Sea and our team discover a sea full of surprises. On the Farne Islands, they come face to face with England's largest colony of grey seals to find out what makes them such extraordinary divers and successful hunters. Grey seals can dive for over forty minutes on a single breath - the team find out how they do it and why they seem to be coping with the changing conditions on the east coast far better than the harbour seal. Elsewhere, Frank looks at the newest form of energy in the North Sea, at a wind farm off the Norfolk coast, and Tooni examines what effect the wind turbines are having on marine life. Paul uncovers the in

May 23, 2011, midnight

In the final programme of the series, explorer Paul Rose, marine biologist Tooni Mahto and underwater archaeologist Frank Pope explore our busy southern shores. As one of the world's busiest shipping lanes, our southern seas are littered with wrecks. Outside Poole harbour, the team join an archaeological excavation of a mysterious 17th century ship. Bearing incredibly ornate carvings of a merman, Frank reveals this is one of the most important underwater discoveries since the Mary Rose. Paul joins the dive team working on the wreck to try to discover where this ship came from. But it's a race against time as the timbers are being destroyed; Tooni wants to find out why. Frank and Tooni examine how we balance the needs of marine life with those of people when the two come into conflict. Studland Bay in Dorset is home to a thriving population of spiny seahorses living amongst the rare eelgrass beds. Only identified as breeding in the area seven years ago, the intensive use of the bay, b

May 30, 2011, midnight