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Normoxic Trimix Diver in worldwide: 24 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 14 publish course prices.
TecDiveTools lists 24 dive centres teaching Normoxic Trimix Diver worldwide. 14 of them publish course prices, in the currency the shop advertises and with the date each was checked — not converted, and not estimated.
Listings are ordered by how much evidence exists about their technical diving, not by a star rating, with any paid Featured listing shown first and marked as such (how rankings work). 14 of these 24 carry reviews we have read and classified as being about technical or overhead training. The count excludes recreational certifications by name, so a busy resort does not outrank a one-instructor cave operation on the volume of its reef trips. Separately, 13 have at least one instructor whose reviews we have read and summarised — a dive centre carries no synthesis of its own. How we read and count reviews.
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About the course
Normoxic Trimix is a technical mixed-gas certification designed to extend depth range to 132–200 fsw (40–60 msw) while managing nitrogen narcosis through trimix theory. This course trains divers in gas blending basics, narcosis mitigation, decompression procedures using nitrox decompression gases, and safe single-gas-switch profiles. The qualification bridges recreational and advanced technical diving, unlocking deeper technical wreck and cave progressions.
Demonstrate safe trimix gas blending, narcosis management through depth planning, decompression gas selection and switching, gas management on technical dives, and emergency procedures specific to mixed-gas technical profiles.
24 dive centres on TecDiveTools teach IANTD Normoxic Trimix Diver worldwide: Thailand (9), Mexico (7), United States (7) and Indonesia (1). Each is listed above.
Published prices for IANTD Normoxic Trimix Diver worldwide range across 4 centres in the TecDiveTools directory — roughly US$1,150 to US$1,500 at current exchange rates. In each centre's own currency: THB 45,000–49,000 (3 centres) and IDR 20,700,000 (1 centre). 2 centres charge by the day instead, which is not comparable with a course total. Prices differ mainly in what they include, so compare the inclusions before comparing the numbers. Prices were last checked in September 2026.
Between 4 and 5 days, based on the durations 2 centres publish for it worldwide. The time depends on the centre's schedule, weather, and how quickly the required skills are demonstrated — agencies set a minimum number of dives, not a fixed number of days.
At the same tier in TecDiveTools' cross-agency comparison, dive centres worldwide also teach TDI Trimix (108), RAID Normoxic Decompression (5), PADI TecRec Tec Trimix 65 (3), SSI XR Technical Extended Range Trimix (1) and PSAI Trimix Fundamentals (1). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.
