TDI

Overview

• TDI (Technical Diving International), founded in 1994, is a leading agency specializing in technical diving. Its parent company is International Training, based in Stuart, Florida (USA), the same group as the recreational agency agency-sdi. [verified — Wikipedia/tdisdi.com]
• It is the agency that established the technical standards for nitrox, CCR (closed-circuit rebreather), cave/wreck diving, and more. [verified]

In Korea

• In this knowledge base's dive-shop data, it is confirmed at 8 shops. Aligned with the demand for technical diving such as deep dives and wrecks in the East Sea, its presence is high along the East Coast. Because it shares a parent company with SDI, many shops offer them together. [verified from dataset]
• For shops that teach this agency, refer to this note's backlinks (dive-shop notes that include agency-tdi in agencies).

For Foreign Divers

• TDI technical certifications are recognized internationally. SDI/TDI broadly accept crossovers from active instructors of recognized agencies such as PADI, SSI, NAUI, CMAS, BSAC, and RAID. [verified — tdisdi.com]

Sources

• domains/09-certification-agencies (tdisdi.com/our-story, /crossover)
• Internal data: aggregation of certification_agencies from data/dive-shops/*.yaml