A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC TechSSI XR

Technical Extended Range Trimix

Official course standards ↗Last updated September 7, 2026

Achieve advanced technical diving by integrating extended-range diving with technical decompression obligations and complex trimix gas management. This advanced course covers complex gas switches during multi-stage decompression, advanced trimix calculations, deep-dive physiology specific to extreme depths, and technical emergency procedures. Technical Extended Range Trimix qualifies you for exploration of the world's deepest technical wreck and cave systems within recreational limits.

Centres that teach this course

6 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 – €1,300across 4 centres pricing in Eurofrom ≈ $953
One centre publishes a price in Indonesian Rupiah.
  • Bali Dive TrekIndonesia
    SSI Technical Extended Range
    IDR 20,700,000
    total
One centre publishes a price in Thai Baht.

Same training under a different agency

25 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 14 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
  • 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 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
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.

    Prerequisites

    Extended Range Trimix certification, minimum 70 logged dives total, minimum 20 logged dives deeper than 30 meters.

    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 SSI XR Technical Extended Range Trimix

    How much does SSI XR Technical Extended Range Trimix cost?

    Published prices for SSI XR Technical Extended Range Trimix range across 6 centres in the TecDiveTools directory — roughly US$950 to US$1,500 at current exchange rates. In each centre's own currency: €850–€1,300 (4 centres), IDR 20,700,000 (1 centre) and THB 37,000 (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 SSI XR Technical Extended Range Trimix take?

    Between 5 and 6 days, based on the durations 3 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 SSI XR Technical Extended Range Trimix?

    SSI XR's standards require: Extended Range Trimix certification, minimum 70 logged dives total, minimum 20 logged dives deeper than 30 meters.

    How many dives do I need before starting SSI XR Technical Extended Range Trimix?

    SSI XR's standards state: Minimum 70 logged dives total.

    What is the equivalent of SSI XR Technical Extended Range Trimix in other agencies?

    At the same tier in TecDiveTools' cross-agency comparison: RAID Normoxic Decompression, IANTD Normoxic Trimix Diver, PADI TecRec Tec Trimix 65, 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 DecompressionIANTD Normoxic Trimix DiverPADI TecRec Tec Trimix 65TDI TrimixPSAI Trimix Fundamentals

    What course comes after SSI XR Technical Extended Range Trimix?

    The next step in SSI XR's progression is SSI XR Hypoxic Trimix.

    SSI XR Hypoxic Trimix

    Where can I take SSI XR Technical Extended Range Trimix?

    1 dive centre and 2 instructors in the TecDiveTools directory teach SSI XR Technical Extended Range Trimix, in Thailand and Indonesia. Each is listed further up this page.

    Does the price of SSI XR Technical Extended Range 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.

    Something wrong on this page? Report it