This book throws light on the fundamentals of designing and construction of a simple underwater Remotely Operated Vehicle(ROV). It explains how an economical ROV can be fabricated and used for numerous applications. This book is handy for college-level students to understand and implement basic concepts of underwater vehicles. We have even included pictures, calculations and test results of an actual ROV prototype that we built ourselves, thus providing you with information and guidance required to build an ROV right from scratch.