A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC TechPSAI

Trimix Fundamentals

Last updated September 21, 2026

Centres that teach this course

1 dive centre 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.

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

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

    • Protec MexicoMexico
      Trimix Level 1
      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

    Same training under a different agency

    26 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 18 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:

    • Third Dimension DivingMexico
      Normoxic Trimix DiverIANTD
      $295/day→ $1,180 for the 4-day minimum
      $295
      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 6 centres pricing in Indonesian Rupiahfrom ≈ $947
    THB 30,000 – THB 59,900across 5 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
    Priced per day or per dive in Mexican Peso — see below.

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

      Same tier, agency not stated

      6 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.

      THB 49,000 – THB 59,900across 3 centres pricing in Thai Bahtfrom ≈ $1,462
      One centre publishes a price in Indonesian Rupiah.
      One centre publishes a price in US Dollar.
      One centre publishes a price in Euro.

      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.

      Instructors Teaching This Course

      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 PSAI Trimix Fundamentals

      How much does PSAI Trimix Fundamentals cost?

      Every centre in the TecDiveTools directory that publishes a price for PSAI Trimix Fundamentals charges by the day rather than for the whole course. 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 PSAI Trimix Fundamentals take?

      6 days, based on the durations 1 centre publishes 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 is the equivalent of PSAI Trimix Fundamentals in other agencies?

      At the same tier in TecDiveTools' cross-agency comparison: RAID Normoxic Decompression, IANTD Normoxic Trimix Diver, PADI TecRec Tec Trimix 65, SSI XR Technical Extended Range Trimix and TDI Trimix. 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 DecompressionIANTD Normoxic Trimix DiverPADI TecRec Tec Trimix 65SSI XR Technical Extended Range TrimixTDI Trimix

      What course comes after PSAI Trimix Fundamentals?

      The next step in PSAI's progression is PSAI Explorer Trimix.

      PSAI Explorer Trimix

      Where can I take PSAI Trimix Fundamentals?

      1 dive centre and 1 instructor in the TecDiveTools directory teach PSAI Trimix Fundamentals, in Mexico. Each is listed further up this page.

      Does the price of PSAI Trimix Fundamentals 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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