The deep ocean is one of the last unexplored places on Earth. But, in order to get to it, some pretty high-tech machines are needed! This STEM set brings together science and engineering in a fun way: through amazing vehicles, including hovercraft and sea planes. Sections on each sea-going machine include clear diagrams, comprehensive explanations about how they work, and full-color photographs about some the coolest examples out there today. Information about how different machines came to be aids readers' understanding of technology development.