The diploma project “PUC” is a comprehensive concept for a positioning and communication tool for divers. Diving is an increasingly significant activity both in the professional field and as a leisure activity. Currently we rely on communication via hand gestures and tapping signals, which is not always possible in any given situation. Visiting the underwater world can be made safer for divers through the provision of an effective underwater communication system. “PUC” enables divers to contact and find each other’s position at any time.