Submarines move deep below the ocean's surface, keeping an eye on other submarines and the ships that sail above them. These underwater warships can fire at enemies and break through thick layers of ice. Discover how these high-tech machines operate underwater for months at a time and learn more about the powerful weapons they use to keep the seas safe and why they are so important to the military.
Mari Bolte has worked in publishing as a writer and editor for more than 15 years. She has written dozens of books about things like science and craft projects, historical figures and events, and pop culture. She lives in Minnesota.