Deep, by James Nestor (a book about ocean, marine life, and exploration)

This book takes us on a freediving journey down the ocean. You won't drown, because the so-called "master switch of life” will turn on, enabling you to push, while recognizing the limits of your body. You will swim with sharks, whales and dolphins, and learn about their incredible electroreception and echolocation abilities. Then you dive deeper and make acquaintance with the wondrous creatures of the deep ocean. The ocean is a magnificent place, and the deeper you go, the more clearly you see yourself.