The story provides a firsthand account of underwater naturalist and veterinarian Dr Chris Harvey-Clark's many diving research adventures with sharks, torpedo rays, endangered Northern Right Whales and other charismatic megafauna in Canadian waters. The book is loaded with fascinating biological discoveries and anecdotes featuring the secret lives of aquatic animals and tells the story of a burgeoning passion for marine species and undersea exploration. From early experiences as a marine biologist and commercial diver to later, first-ever studies with Greenland sharks, torpedo rays, beavers and ultimately Great White sharks in Canadian waters, Chris gives you an immersive look at the unique animals and people encountered in Canada's three oceans, as global warming changes the invisible underwater world that surrounds us.