Britain's Secret Seas S01E01 - Giants of the West

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.