This book introduces students, educators and other aspiring inventors to subsea technology. This exciting resource provides the information needed to design and build underwater vehicles. It also encourages bright young minds to consider a career in the world of underwater robotics. This textbook is written for advanced high school classes or college and university entry-level courses. Each chapter begins with a true scenario that sets the stage for the ocean science, physics, math, electronics, and engineering concepts that follow. The final chapter features step-by-step plans for building SeaMATE, a basic shallow-diving ROV. There is also a "What's Next?" section that's full of ideas for modifications and more complex underwater projects. The 850-page informative text is enhanced by hundreds of photos, illustrations, and diagrams of underwater vehicles. In addition, the textbook includes a discussion of subsea vehicle development, resource appendices, an extensive glossary, and a complex index. Textual Aids and Information: All chapters include an outline, learning outcomes, and summary. Each chapter is introduced by a real-life scenario (called Stories From Real Life) that relates the basic theoretical information of that chapter to an actual subsea event. There are over 500 photographs and illustrations throughout this book. The wealth of color photographs helps readers connect with actual examples of subsea robotics. The straight-forward illustrations are designed to expand and explain textual concepts. Measurements are given in metric units, generally with imperial equivalents. The emboldened terms in the text are defined in the glossary. An index helps locate terms. The appendices provide helpful tables of information, useful facts, equations, and suggestions for finding materials and resources.