Offered certifications in the United States for over 50 years, until the end of the program in 2008. Offers a way to replace lost lifetime certification cards issued after 1984.

Association of independent dive clubs in the United Kingdom. Includes information about courses, a schedule, a map of clubs, and photo galleries.

The Governing Body for the sport of scuba diving in Scotland. Established in 1953 and proud holder of one of the best safety records in amateur diving.

Enriched Air, Cave, Wreck, Rebreather, Trimix, Gas Blenders, Technical Scuba Divers, Instructors and Instructor Trainers.

An international training and certification agency with instructors and training facilities located worldwide.

PSI offers worldwide training in Visual Cylinder Inspection and High Pressures Cylinder Safety. Includes class schedule, inspector notices, and supplies.

Provides a full range of technical and recreational courses. Includes affiliate dive centers, news and events, and contact information.

International diving training agency which provides programs, products and services to diving professionals. Includes description of certifications, recognitions, news, and contact information.

Technical Diving International (TDI) and Scuba Diving International(SDI)regional office located in Auckland. Find mission statement, news, photos, information on training facilities, and contacts.