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. Apex books have low reading levels (grades 2–3) but are designed for older students, with interest levels of grades 3–7.