In a diving emergency, knowing whether to call DAN (Divers Alert Network) or EMS (Emergency Medical Services) first can be confusing. If a diver shows mild symptoms of decompression illness (DCI), it’s important to contact DAN for remote support and also activate EMS if transport to a medical facility is needed. For severe symptoms, EMS should be contacted immediately, as they can provide life-saving measures. Collaboration between DAN and EMS is crucial for effective emergency response in diving incidents.