This course is for people who have been spearfishing for some time and who want to acquire reliable tools in order to progress in depth in good conditions. This course is also for hunters who have been practicing for several years, but who are limited by depth. On the program Morning: Meeting at 8:00 a.m. -Presentation of trainees and expectations. -Legislation and regulation of general and local underwater fishing. -Presentation of equipment specific to Underwater Fishing -Settings -Knowing how to equip yourself properly. 1) Theory -Physiology of apnea, accidents, prevention 2) Practice of static and depth apnea -Management of ventilation, preparation, relaxation, immersion techniques, pre-compensation, verticality...management of the compensation Afternoon: -Knowing how to evolve in pairs and securing yourself -Knowing how to communicate in evolution, holding the crossbow, approach.. -Knowing how to use the crossbow and use the approach technique according to the area Fishing situation by developing observation and discretion. -Knowledge of target species and approach techniques -Cleaning and recovery of catches Debriefing