Before reading this book, my knowledge of freediving encompassed only those few techniques we're taught in scuba diving. If, like me, you've always wondered why someone would bother with freediving when scuba diving exists, well this book should answer the question. That said, "Deep" isn't so much about freediving as it is about science/observations conducted by those who practice it. As such, much of the book is about the author's various expeditions with other freedivers and their observations diving with whales, dolphins, sharks, etc. Considering there isn't really...