A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC TechSSI XR

Extended Range Nitrox Diving

Official course standards ↗Last updated September 7, 2026

Extend your enriched-air nitrox diving to deeper depths and longer bottom times with extended-range training and oxygen-toxicity management. This course teaches enriched-air diving at extended depths, oxygen-toxicity risk mitigation via CNS and OTU tracking, and extended bottom-time planning with nitrox mixtures. Extended Range Nitrox Diving opens progression to technical diving specialties and is particularly valuable for recreational technical divers exploring wreck and cave sites.

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.

€450 – €580across 4 centres pricing in Eurofrom ≈ $505
One centre publishes a price in Indonesian Rupiah.
  • Bali Dive TrekIndonesia
    SSI Extended Range Nitrox Diving
    IDR 8,400,000
    total
One centre publishes a price in Thai Baht.
  • Tech Dive AsiaThailand
    Tech Level Oneone price, several agencies
    THB 24,900
    total

Same training under a different agency

33 centres

A separate set of centres, teaching Advanced Nitrox 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.

€400 – €680across 12 centres pricing in Eurofrom ≈ $449

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

$600 – $990across 6 centres pricing in US Dollar

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

  • Cave AdventurersUnited States
    Advanced NitroxTDI
    Private class$450/day→ $900 for the 2-day minimum
    Group class$350/day→ $700 for the 2-day minimum each
    $450
    per day
  • Protec MexicoMexico
    Advanced NitroxPSAI
    1 student$440/day→ $2,200 for the 5-day minimum
    2+ students$390/day→ $1,950 for the 5-day minimum each
    $440
    per day
  • Horizon DiversUnited States
    PADI Tec 40 DiverPADI TecRec
    $900
    per person
  • CDT Mexico (Cave Diving Training)Mexico
    Advanced NitroxTDI
    1 student$300/day→ $900 for the 3-day minimum
    $300
    per day
  • Divers UnderGroundMexico
    TDI Advanced NitroxTDI
    $325/day
    $325
    per day
  • Under The JungleMexico
    Advanced NitroxTDI
    private$345/day→ $1,035 for the 3-day minimum
    per diver in a group$295/day→ $885 for the 3-day minimum each
    $345
    per day
IDR 7,500,000 – IDR 15,000,000across 5 centres pricing in Indonesian Rupiahfrom ≈ $418

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

  • Air Dive AlorIndonesia
    Advanced NitroxTDI
    1 student, privateIDR 3,200,000/day→ IDR 6,400,000 for the 2-day minimum
    3 studentsIDR 2,400,000/day→ IDR 4,800,000 for the 2-day minimum each
    IDR 3,200,000
    per day
THB 8,900 – THB 25,000across 5 centres pricing in Thai Bahtfrom ≈ $265
₱28,450 – ₱32,950across 2 centres pricing in Philippine Pesofrom ≈ $451
  • Tech AsiaPhilippines
    TDI Advanced NitroxTDI
    ₱28,450
    total
  • Tech AsiaPhilippines
    PADI Tec 40PADI TecRec
    ₱32,950
    total
One centre publishes a price in Mexican Peso.

Same tier, agency not stated

8 centres

These centres publish a price for Advanced Nitrox, 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 24,000 – THB 30,000across 3 centres pricing in Thai Bahtfrom ≈ $716
$600 – $900across 2 centres pricing in US Dollar
€370 – €450across 2 centres pricing in Eurofrom ≈ $415
One centre publishes a price in Indonesian Rupiah.

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

Deep Diving certification, Enriched Air Nitrox 40 certification, minimum 24 logged dives.

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 Extended Range Nitrox Diving

How much does SSI XR Extended Range Nitrox Diving cost?

Published prices for SSI XR Extended Range Nitrox Diving range across 6 centres in the TecDiveTools directory — roughly US$460 to US$750 at current exchange rates. In each centre's own currency: €450–€580 (4 centres), IDR 8,400,000 (1 centre) and THB 24,900 (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 SSI XR Extended Range Nitrox Diving take?

Between 2 and 5 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 Extended Range Nitrox Diving?

SSI XR's standards require: Deep Diving certification, Enriched Air Nitrox 40 certification, minimum 24 logged dives.

How many dives do I need before starting SSI XR Extended Range Nitrox Diving?

SSI XR's standards state: Minimum 24 logged dives.

What is the equivalent of SSI XR Extended Range Nitrox Diving in other agencies?

At the same tier in TecDiveTools' cross-agency comparison: PSAI Advanced Nitrox, TDI Advanced Nitrox, RAID Decompression and PADI TecRec Tec 40. 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.

PSAI Advanced NitroxTDI Advanced NitroxRAID DecompressionPADI TecRec Tec 40

What course comes after SSI XR Extended Range Nitrox Diving?

The next step in SSI XR's progression is SSI XR Extended Range.

SSI XR Extended Range

Where can I take SSI XR Extended Range Nitrox Diving?

1 dive centre and 3 instructors in the TecDiveTools directory teach SSI XR Extended Range Nitrox Diving, in Thailand and Indonesia. Each is listed further up this page.

Does the price of SSI XR Extended Range Nitrox Diving include gas and equipment?

Not always — it varies by centre. 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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