This course provides students with a hands-on introduction to the design and development of underwater robotic systems. The first half of the course focuses on foundational topics such as waterproofing, buoyancy, propulsion, and basic control systems - core principles that apply to Remotely Operated Vehicles (ROVs). These sessions equip students with practical skills for building functional underwater robots. In the second half, the course transitions to more advanced topics such as onboard sensing, computer vision, navigation, sensor fusion, and path planning - essential elements of Autonomous Underwater Vehicles (AUVs). This progression from ROV to AUV gives students a complete view of underwater robotics, from mechanical construction to autonomy and intelligence. By the end of the course, students will have designed, built, and tested their own AUV capable of autonomous maneuvering and object detection.