Scuba Diving International (SDI) and Technical Diving International (TDI)

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Scuba Diving International (SDI) and Technical Diving International (TDI), form one of the largest scuba certification agencies in the world. Represented in 120 countries including a regional office in Southern Africa. SDI focuses training on recreational diving whereas TDI offers advanced diver training including Cave, Rebreather and deep Trimix diving.