It was the beginning of a life-long fascination with these 'lords of the sea', and the oceanic life around them. His career as one of the world's most popular naturalists and explorers has taken him to countless underwater places, many never before seen by others.

And he's also been witness to the startling decline in fortune of our oceans' wild inhabitants over the past fifty years. Deep Blue is a book a lifetime in the making: a remarkable blend of memoir, travel, and marine and environmental science that takes us on an unforgettable tour of the many worlds of aquatic life: from underwater deserts and rainforests to the evolution of ocean heroes like the sea turtle and the Great White, from the genesis of ocean life to the rapidly declining state of white polar seas and coral reefs. It's both a love letter to our precious oceans and rallying cry for what we must to do save them.