The ocean has shaped and sustained life on Earth for billions of years. Its waters contain our past, from the deep history of evolutionary time to exploration and colonialism; our present, as a place of solace and pleasure, and as the highway that underpins the global economy; and – as waters heat and sea levels rise ever higher – our future. ‘Deep Water’ is both a hymn to the beauty, mystery and wonder of the ocean, and a reckoning with our complex relationship to the natural world. It is a book shaped by tidal movements and deep currents, and lit by the presence of other minds and other ways of being. Weaving together science, history and personal reflection, it explores the way the ocean connects every living being on Earth, the origins of the environmental catastrophe that is overtaking us, and the question of what lies ahead.