In this landmark series, four beautifully-crafted episodes, dive into the natural wonders of the Celtic seas – featuring some of the largest creatures of the deep ocean, birds that can ‘fly’ underwater, and the tiniest animals with the biggest personalities. Filmed over the course of a year by highly experienced underwater and top-side wildlife and documentary makers, these cinematic films bring to life an incredible secret world, populated by extraordinary inhabitants. With great story telling and incredible imagery, the series looks at stories of courtship, birth and the struggle for survival - a glorious celebration of life and renewal.