A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC Tech (50m)PADI TecRec

Tec 50 Trimix

Official course standards ↗Last updated September 7, 2026

Apply advanced trimix gas strategies at Tec 50 depths to explore deep technical sites with confidence in gas blending and narcosis control. The Tec 50 Trimix course teaches complex trimix blends, hypoxic trimix applications, extreme narcosis management through precise gas selection, and extended decompression planning with multiple bailout options. You'll master the physiology of deep technical diving—oxygen toxicity, nitrogen narcosis, high-pressure nervous syndrome—and how to mitigate these risks through gas engineering. Tec 50 Trimix qualifies you for the deepest technical wreck and cave exploration within recreational training limits.

Centres that teach this course

2 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.

One centre publishes a price in Euro.
One centre publishes a price in Thai Baht.
  • Tech Dive AsiaThailand
    Tech Level Three — PADI Tec 50 Trimixone price, several agencies
    THB 44,900
    total

Same training under a different agency

17 centres

A separate set of centres, teaching Helitrox / Advanced Recreational 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.

€550 – €1,200across 12 centres pricing in Eurofrom ≈ $617
THB 25,000 – THB 35,000across 5 centres pricing in Thai Bahtfrom ≈ $746
Priced per day or per dive in US Dollar — see below.

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

    • Elite Divers InternationalMexico
      Advanced Recreational Trimix (Helitrox) DiverIANTD
      $275/day→ $1,100 for the 4-day minimum
      $275
      per day
    • Third Dimension DivingMexico
      Advanced Recreational Trimix Diver (Helitrox)IANTD
      $295/day→ $1,180 for the 4-day minimum
      $295
      per day
    • Cave AdventurersUnited States
      HelitroxTDI
      Private class$450/day→ $1,350 for the 3-day minimum
      Group class$350/day→ $1,050 for the 3-day minimum each
      $450
      per day
    IDR 18,000,000 – IDR 20,700,000across 2 centres pricing in Indonesian Rupiahfrom ≈ $1,003
    • Bali Dive TrekIndonesia
      IANTD Advanced Recreational TrimixIANTD
      IDR 20,700,000
      total
    • Sulawesi Dive TrekIndonesia
      Advanced Recreational TrimixIANTD
      IDR 18,000,000
      total
    One centre publishes a price in Philippine Peso.
    • Tech AsiaPhilippines
      TDI HelitroxTDI
      ₱28,950
      total

    Same tier, agency not stated

    1 centre

    These centres publish a price for Helitrox / Advanced Recreational 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.

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

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

      • Darkside DiversMexico
        Helitrox Diver
        $250/day→ $1,000 for the 4-day minimum
        $250
        per day

      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

      PADI Tec 50 Diver, 100 logged dives, 18 years old

      Standards

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

      Calculate and blend complex trimix mixes; manage hypoxic trimix and extreme narcosis; plan extended decompression with multiple stage gases; demonstrate advanced gas-switching techniques at depth

      No instructors or dive centres found 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 PADI TecRec Tec 50 Trimix

      How much does PADI TecRec Tec 50 Trimix cost?

      Published prices for PADI TecRec Tec 50 Trimix range across 2 centres in the TecDiveTools directory — roughly US$850 to US$1,350 at current exchange rates. In each centre's own currency: €800 (1 centre) and THB 44,900 (1 centre). 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 PADI TecRec Tec 50 Trimix take?

      5 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 are the prerequisites for PADI TecRec Tec 50 Trimix?

      PADI TecRec's standards require: PADI Tec 50 Diver, 100 logged dives, 18 years old.

      What is the minimum age for PADI TecRec Tec 50 Trimix?

      PADI TecRec's standards state: 18 years old.

      How many dives do I need before starting PADI TecRec Tec 50 Trimix?

      PADI TecRec's standards state: 100 logged dives.

      What does PADI TecRec Tec 50 Trimix training involve?

      According to PADI TecRec's published standards: Calculate and blend complex trimix mixes; manage hypoxic trimix and extreme narcosis; plan extended decompression with multiple stage gases; demonstrate advanced gas-switching techniques at depth.

      What is the equivalent of PADI TecRec Tec 50 Trimix in other agencies?

      At the same tier in TecDiveTools' cross-agency comparison: IANTD Advanced Recreational Trimix Diver, SSI XR Extended Range Trimix and TDI Helitrox. 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.

      IANTD Advanced Recreational Trimix DiverSSI XR Extended Range TrimixTDI Helitrox

      Does the price of PADI TecRec Tec 50 Trimix 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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