Program Information PADI is the world leader in Scuba Diving training and a membership organization for thousands of professional Scuba Divers throughout the world. PADI is an international organization with headquarters in Rancho Santa Margarita CA and regional headquarters in Bristol, UK and Sydney AU. In business since 1966 PADI has been instrumental in developing the finest quality curriculum for Scuba Diving training and has a presence in virtually every nation in the world.