This exciting series highlights eight types of vehicles that militaries around the world use to find, fight, and spy on enemy forces. Each book describes one machine's history, key features, and roles in battle. This book describes the history, features, and uses of submarines. Short paragraphs of easy-to-read text are paired with plenty of colorful photos to make reading engaging and accessible. The book also includes a table of contents, fun facts, sidebars, comprehension questions, a glossary, an index, and a list of resources for further reading. AGES: 7 to 9 Hardcover Reinforced Library Binding