In the hall of the Federation of Dodecanesian Associations in Athens-Piraeus, on November the 9th, 2011, a celebration for the 50th founding anniversary of our Society took place. The speakers were the well-known geologists Professors of Athens University and friends of Nisyros Dr. D. Papanikolaou, Ef. Lekas and Par. Nomikou. Images from the underwater volcanoes research in the vicinity of Nisyros sea area were shown. The crowd that filled the hall enjoyed the scientific grounding of speakers who vividly presented their views on the geological aspects of Nisyros. A diploma award followed to persons who have helped in any way our Association.