The technology of autonomous underwater vehicles and their various applications are elucidated in a sophisticated and comprehensive way in this book. Autonomous Underwater Vehicles are robotic engines which travel underwater in order to study underwater activities. The successful developments of parallel research and technological studies that were underway; helped to conquer the challenges associated with autonomous operation in tough conditions. The ultimate aim behind all these advancements was to procure accurate data through economical means in lesser time using accurate geo locations. Some new models are already being employed to extract the best out of the present technology by making decisions according to the interpretation of the sensor data. This book is the comprehensive compilation of various aspects of AUV technology and its applications. Vehicle designing, navigation & control techniques and mission preparation & analysis are some of the topics that this book covers. It provides an overview of brighter prospects of vehicle technology and application.