A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC Tech (60m)IANTD

Normoxic Trimix Diver

Official course standards ↗Last updated September 7, 2026

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.

Centres that teach this course

10 dive centres in the directory publish a price for this exact certification, checked Sep 2026. Each centre's own wording is shown beneath its name. Ranges cover whole-course prices only — where a centre charges per day or per dive, its rate is listed separately below, since a daily figure is not comparable with a course total.

€850 – €3,000across 4 centres pricing in Eurofrom ≈ $953
THB 45,000 – THB 49,000across 3 centres pricing in Thai Bahtfrom ≈ $1,342
Priced per day or per dive in Mexican Peso — see below.

    Charged by the day or dive rather than as a course price:

    Priced per day or per dive in US Dollar — see below.

      Charged by the day or dive rather than as a course price:

      One centre publishes a price in Indonesian Rupiah.

      Same training under a different agency

      24 centres

      A separate set of centres, teaching Normoxic Trimix under a different agency. These are not the same certification — the standards and the card differ — but they cover the same depth and scope, which is why centres price them alike. Every row here names whose rating it is, and none of them is counted above.

      €700 – €3,000across 15 centres pricing in Eurofrom ≈ $785
      $1,500 – $1,600across 3 centres pricing in US Dollar

      Charged by the day or dive rather than as a course price:

      • Protec MexicoMexico
        Trimix Level 1PSAI
        1 student$470/day→ $2,820 for the 6-day minimum
        2+ students$420/day→ $2,520 for the 6-day minimum each
        $470
        per day
      • Cave AdventurersUnited States
        TrimixTDI
        Private class$550/day→ $1,650 for the 3-day minimum
        Group class$450/day→ $1,350 for the 3-day minimum each
        $550
        per day
      • Divers UnderGroundMexico
        TDI Trimix DiverTDI
        $325/day
        $325
        per day
      • Under The JungleMexico
        Normoxic TrimixTDI
        private$345/day→ $1,725 for the 5-day minimum
        per diver in a group$295/day→ $1,475 for the 5-day minimum each
        $345
        per day
      IDR 17,000,000 – IDR 29,700,000across 5 centres pricing in Indonesian Rupiahfrom ≈ $947
      THB 30,000 – THB 59,900across 4 centres pricing in Thai Bahtfrom ≈ $895
      ₱54,000 – ₱64,000across 2 centres pricing in Philippine Pesofrom ≈ $856
      • Tech AsiaPhilippines
        TDI Trimix DiverTDI
        ₱54,000
        total
      • Tech AsiaPhilippines
        PADI Tec Trimix 65PADI TecRec
        ₱64,000
        total

      Same tier, agency not stated

      3 centres

      These centres publish a price for Normoxic Trimix, but their own wording does not say which agency's certification it buys — many teach several and name the card only once you enquire, and some price one course for either agency. The figure is comparable; the certification is not identified, so we do not guess at one.

      One centre publishes a price in Thai Baht.
      One centre publishes a price in Indonesian Rupiah.
      One centre publishes a price in US Dollar.

      These prices are not like-for-like. Two centres can charge very differently for the same certification because they include different things. One price may cover twinsets, stages, deco gas and cylinder rental for every training dive, a dedicated classroom for the theory, boat or transport to the site, and the agency's registration and materials; another may be tuition only, with all of that charged separately — or the other way round, with a centre bundling in extras the first leaves out. Class size, whether the course is one-to-one, and how many days are allowed for it move the figure too. Check what each centre's price includes before comparing them, and confirm with the centre before booking.

      Consumables are usually extra. Sorb, helium, O₂ and other fills, park and cenote fees, certification fees and rental are commonly charged on top.

      Packages combining several certifications, upgrades from an existing one, and open-ended day rates are excluded — none of them is the standalone price of this course, and including them would move the figures away from what a new student can actually book.

      Prerequisites

      IANTD Advanced EANx Diver or equivalent certification, minimum 18 years old. Proof of minimum 100 logged dives, including at least 10 non-training dives to depth of 120 fsw (36 msw) requiring mandatory decompression stops.

      Standards

      What a diver must demonstrate to pass this course — not always published by the certifying agency.

      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.

      Instructors Teaching This Course

      Other locations

      Michael David Fowler

      Dive Centres Offering This Course

      We're still building out the directory country by country, so this list isn't every instructor or dive centre teaching it in the world — more locations are coming soon.

      Common questions about IANTD Normoxic Trimix Diver

      How much does IANTD Normoxic Trimix Diver cost?

      Published prices for IANTD Normoxic Trimix Diver range across 8 centres in the TecDiveTools directory — roughly US$950 to US$3,400 at current exchange rates. In each centre's own currency: €850–€3,000 (4 centres), 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.

      How long does IANTD Normoxic Trimix Diver take?

      Between 4 and 5 days, based on the durations 5 centres publish for it. 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.

      What are the prerequisites for IANTD Normoxic Trimix Diver?

      IANTD's standards require: IANTD Advanced EANx Diver or equivalent certification, minimum 18 years old. Proof of minimum 100 logged dives, including at least 10 non-training dives to depth of 120 fsw (36 msw) requiring mandatory decompression stops.

      What is the minimum age for IANTD Normoxic Trimix Diver?

      IANTD's standards state: Minimum 18 years old.

      How many dives do I need before starting IANTD Normoxic Trimix Diver?

      IANTD's standards state: Proof of minimum 100 logged dives.

      What does IANTD Normoxic Trimix Diver training involve?

      According to IANTD's published standards: 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.

      What is the equivalent of IANTD Normoxic Trimix Diver in other agencies?

      At the same tier in TecDiveTools' cross-agency comparison: RAID Normoxic Decompression, PADI TecRec Tec Trimix 65, SSI XR Technical Extended Range Trimix, TDI Trimix and PSAI Trimix Fundamentals. They cover comparable training, but each agency sets its own standards, depth limits and certification card, so they are comparable rather than interchangeable — check which one your next course accepts.

      RAID Normoxic DecompressionPADI TecRec Tec Trimix 65SSI XR Technical Extended Range TrimixTDI TrimixPSAI Trimix Fundamentals

      What course comes after IANTD Normoxic Trimix Diver?

      The next step in IANTD's progression is IANTD Trimix Diver.

      IANTD Trimix Diver

      Where can I take IANTD Normoxic Trimix Diver?

      24 dive centres and 35 instructors in the TecDiveTools directory teach IANTD Normoxic Trimix Diver, in the United States, Mexico, Thailand and Indonesia. Each is listed further up this page.

      Does the price of IANTD Normoxic Trimix Diver include gas and equipment?

      Not always — it varies by centre. Helium, certification fees, equipment rental and boat or site fees are commonly charged on top of the course price. Each centre's price list on TecDiveTools shows what it notes as included.

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