PADI: Professional Association of Diving Instructors®. The Way the World Learns to Dive®. PADI is the world’s leading scuba diver training organization.

The Confederation Mondiale des Activites Subaquatiques (CMAS) is the World Underwater
Federation. It was founded in Brussels on September 28, 1958. As such, it is one of the world’s
oldest scuba diving organizations.

Technical Diving International (TDI) claims to be the largest technical diving certification agency in the world, and one of the first agencies to offer mixed gas and rebreather training.

For scuba divers worldwide, DAN means safety, health and peace of mind. The Divers Alert Network (DAN) is a global network of not-for-profit, member-based, dive safety organizations working to enhance dive safety for all recreational divers.