Primary agencies offering Technical Diving certifications and support to technical diving instructors.
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- Technical Diving International (TDI) Technical diver certification agency providing course descriptions on mixed gas diving, overhead environment and rebreathers.
- IANTD - The International Association of Nitrox and Technical Divers IANTD launched the world's first nitrox course, and now offer a complete range of training options from open water diver to Expedition Trimix, including cave and rebreather training.
- PSAI - Professional Scuba Association International Founded in the 1960s by Hal Watts, PSAI offers courses in all technical diving disciplines.