The role of the Diver Medic Technician (DMT) is to provide care in the event of a diving accident. As this care can have a significant impact on the injured diver's life, it is crucial for the DMT to receive comprehensive training to ensure preparedness for a range of scenarios. The Institut National de Plongée Professionnelle (INPP) in Marseille, France offers IMCA DMT training in accordance with the guidelines outlined in this handbook. All concepts within this book conform to the IMCA DMT training programme and are presented in a format suitable for use during diving missions. The chapters encompass DMT principles and incorporate a "How To" section detailing optimal practices for first aid and advanced care giving, with all pertinent concepts and laws included. Additionally, the contents page provides an overview of all the chapters, and each significant subject area has its own contents page to aid comprehension and efficient information retrieval.