This one-credit scuba diving selective involves completion of two modules. Module I provides theoretical and practical training in avoiding, recognizing, and managing dive-related emergencies underwater, at the surface, and on land. Module I, which is taught by professional dive instructors, takes two days and leads to PADI Rescue Diver certification. Module II provides an introduction to hyperbaric oxygen treatment for dive-related injuries and includes training in conducting a neurological exam in persons suspected of having decompression illness. Module II involves seven hours of classroom sessions scheduled across multiple days. Prerequisites for this selective are Advanced Open-Water Diver certification and Basic Life Support certification.