A colourful visual journey from the shoreline to the ocean’s depths to celebrate the sheer diversity of life beneath the waves. Three quarters of the ocean has never been seen by humans. Drawing on the recent success of Trees, this companion book explores our oceans, taking readers on a deep dive through the different depth zones – from the shoreline and surface, via the sunlight zone, the twilight and midnight zones and into the great abyss – to chart the richness and diversity of life found in our seas. Each chapter, centred on a different depth zone, begins with a comprehensive introduction, before exploring 15-25 visual themes, from the smallest living things to the largest and the familiar to the little-known. A final chapter on the oceans and us reveals the visual history of human interaction with the deep blue, from discovery and mapping to current issues of the environment and preservation.