Oceans cover 71 percent of Earth, yet we have barely begun to explore their depths. Exploring the ocean is all the more challenging because of extreme cold and the lack of oxygen and light. This thrilling book discusses the equipment needed, and the technology used in ocean exploration, ranging from diving bells, submarines, to SCUBA gear. Beautiful full-color photos take us on a journey under the sea, showing fascinating sea life, such as the whale shark, the monstrous kraken, the hagfish, and tube worms.