Dive deep with the U.S. Navy's stealthiest machines! Submarines are silent, powerful vessels built for secret missions and underwater warfare. Discover how submarines navigate the deep, launch torpedoes, and stay hidden from enemies. Learn about sonar systems, crew life in tight quarters, and the intense training it takes to serve below the surface in this high-energy book for reluctant readers.Bold visuals and accessible text give readers an exciting look at life aboard, making this hi-lo title a top pick for adventure seekers and future recruits. Includes a table of contents, glossary with pronunciations, and index.