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Advanced Trimix in worldwide: 73 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 22 publish course prices.
TecDiveTools lists 73 dive centres teaching Advanced Trimix worldwide. 22 of them publish course prices, in the currency the shop advertises and with the date each was checked — not converted, and not estimated.
Listings are ordered by how much evidence exists about their technical diving, not by a star rating, with any paid Featured listing shown first and marked as such (how rankings work). 55 of these 73 carry reviews we have read and classified as being about technical or overhead training. The count excludes recreational certifications by name, so a busy resort does not outrank a one-instructor cave operation on the volume of its reef trips. Separately, 43 have at least one instructor whose reviews we have read and summarised — a dive centre carries no synthesis of its own. How we read and count reviews.
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About the course
Advanced technical diving course extending trimix diving into hypoxic gas territory at depths exceeding 70m/230ft. Teaches hypoxic gas planning, extended decompression management with multiple gases, and equipment redundancy required at extreme depths. Represents the top of open-circuit depth progression before rebreather training.
Minimum 4 dives with 100 minutes accumulated bottom time. At least 2 dives deeper than 70m/230ft. In-water skills: gas management at extreme depth, multi-stage decompression execution, buoyancy control at pressure, emergency procedures with stage cylinders. Competency in hypoxic gas calculations and extended decompression gas switching.
73 dive centres on TecDiveTools teach TDI Advanced Trimix worldwide: United States (20), Egypt (19), Philippines (11), Malta (7), Mexico (7) and Thailand (5), and 1 more. Each is listed above.
Published prices for TDI Advanced Trimix worldwide range across 11 centres in the TecDiveTools directory — roughly US$900 to US$5,650 at current exchange rates. In each centre's own currency: €995–€5,000 (7 centres), $1,900–$2,400 (2 centres), IDR 17,000,000 (1 centre) and THB 80,000 (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.
Between 4 and 8 days, based on the durations 7 centres publish for it worldwide. 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.
At the same tier in TecDiveTools' cross-agency comparison, dive centres worldwide also teach IANTD Trimix Diver (13) and PADI TecRec Tec Trimix Diver (3). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.
