The farther down you go into the ocean, the colder and darker it gets—and some interesting creatures lurk down there! In this fun, interactive book, readers 9 to 12 will learn about the different layers of the ocean and the many mammals and fish that live in it. Then they can follow the simple instructions to assemble five sturdy cardstock models of a sea otter, a leatherback turtle, a whale shark, a deep-sea anglerfish, and a blue-ringed octopus.