Oceans are central to the story of civilisation – so why do so many of us feel disconnected from them?

It was on day 11, I think, that I stopped getting out of bed at all. I had already let my hygiene standards slip to the point that a large knot was starting to form in my hair. Later my mother would have to cut it out with scissors. She didn’t mind. We were all in the same boat.

I was nine years old, and nearly two weeks into sailing across the Atlantic with my family. My father had sailed all his life, and introduced my mother to it; and they spent years preparing to sail around the world. Including my little sister, that made four of us aboard a 52ft yacht – our home for four years from 2000, in which time we got from Dorset to New Zealand.