This title provides readers with a fascinating look at the mighty military submarines. Vivid photographs and easy-to-read text aid comprehension for readers as they go under water to explore the military's sneaky ships. Features include a table of contents, two infographics, fun facts, a sidebar, Making Connections questions, a glossary, and an index. QR Codes in the book give readers access to book-specific resources to further their learning. Aligned to Common Core Standards and correlated to state standards. DiscoverRoo is an imprint of Pop!, a division of ABDO.