"For some, exploring the depths of a dark cave is the ultimate rush of excitement. But what if the cave was filled with water? Readers get to experience this dangerous thrill from the safe pages of this exciting book. Readers splash through the dark and explore the world hidden deep in the water. From the equipment needed to safely participate to a few of the amazing places divers explore, this book explores the unseen and often unexplored parts of a world full of wonder.".