This textbook for beginner divers provides all the information and knowledge areas that newcomers need to learn in order to successfully complete a diving training program and pass the final exams for CMAS certification. Extensively illustrated and pedagogically structured based on the experience of thousands of diving trainings, this is the official textbook of CMAS Germany, which brings together the most important German-speaking diving organizations such as Barakuda, FIT, VIT, IDA, and many more, as well as major sports associations like DLRG and VDST. All of them use this textbook for the training of beginners, making it the standard work for introductory diving education. The CMAS (Confédération Mondiale des Activités Subaquatiques) is the largest diving organization in the world as an umbrella organization. Its training guidelines are recognized worldwide, and CMAS certifications are valid in many diving locations.