The book begins with the fundamental principles of submersible and ROV design and then discusses the evolution of these technologies. Later chapters delve into specific areas of deep-sea research, such as hydrothermal vent exploration and biodiversity studies, culminating with a look at the future of underwater technology, including autonomous underwater vehicles (AUVs) and artificial intelligence. The approach balances technical details with clear explanations, appealing to students, researchers, and anyone interested in Earth Sciences Geography and Technology.