Each book in the DK Readers series is specially crafted to suit the interests and learning stages of beginning readers. Submarines and Submersibles follows a team of scientists down to the ocean's depths in a vivid introduction to the world of underwater craft.Each book in the DK Readers series is specially crafted to suit the interests and learning stages of beginning readers. Submarines and Submersibles follows a team of scientists down to the ocean's depths in a vivid introduction to the world of underwater craft.