The first submarine was built in the 1600s. Engineering capabilities have advanced immensely since then, making submarines one of the world's most interesting means of transportation. Engrossed readers will learn about the ingenious engineering behind submarines, from construction to the ins-and-outs of how they work. STEM concepts help readers understand the science that makes submarines possible. Accessible text paired with full-color photographs and intriguing fact boxes will draw readers in and aboard this underwater marvel.