Oliver Perschke Instruktor Gasblender Instructor JJ-CCR-Level1 JJ-CCR-Level2 JJ-CCR-Level3 OC-Advanced Trimix-Diver OC-Advanced-Nitrox-Open-Water-Diver OC-Deco-Diver OC-Drysuit OC-Extended Range-Diver OC-Nitrox-Diver OC-Recreational Trimix-Diver
