An information and puzzle book combined, which explores underwater habitats, from coral reefs to Arctic waters, from the ocean bed to the rocky shore. The book focuses on a wide variety of activities, from shipwreck or reef dives, to undersea oil-rig maintenance and deep-sea exploration. The combination of divers, sealife and underwater machines creates an entertaining and instructive game for children of all ages, and should afford them hours of enjoyment. Each underwater scene is enlivened by colourful and realistic illustrations, while keys at the back provide answers when a child gets stuck. A comprehensive index can also be used as a fact finder.