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Trimix Dive Centres Worldwide
Trimix in worldwide: 108 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 33 publish course prices.
108 dive centres
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Trimix in worldwide: 108 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 33 publish course prices.
TecDiveTools lists 108 dive centres teaching Trimix worldwide. 33 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). 80 of these 108 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, 61 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
Trimix is TDI's foundational mixed-gas course, teaching divers to plan and execute decompression dives using custom oxygen/helium/nitrogen breathing gas mixtures. This course bridges Extended Range and deeper technical diving, introducing divers to trimix theory, helium physiology, staged decompression on multiple gas mixes, and the procedures for managing hypoxic and normoxic blends. Graduates can conduct trimix dives to 60m/200ft with proper decompression support.
Students complete 4 decompression dives using trimix as bottom gas (100+ minutes accumulated bottom time; 2 dives must exceed 40m/130ft depth), demonstrating mastery of: trimix gas physics and physiology, decompression calculations on multiple gas mixes, proper equipment configuration, safe gas switches at depth, emergency ascent procedures, and staged decompression execution.
108 dive centres on TecDiveTools teach TDI Trimix worldwide: United States (32), Egypt (19), Thailand (15), Mexico (14), Philippines (12) and Malta (10), and 1 more. Each is listed above.
Published prices for TDI Trimix worldwide range across 14 centres in the TecDiveTools directory — roughly US$850 to US$1,800 at current exchange rates. In each centre's own currency: €850–€1,600 (7 centres), THB 30,000–59,900 (3 centres), $1,500–$1,520 (2 centres), ₱54,000 (1 centre) and IDR 17,000,000 (1 centre). 3 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 3 and 5 days, based on the durations 10 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 Normoxic Trimix Diver (24), RAID Normoxic Decompression (5), PADI TecRec Tec Trimix 65 (3), SSI XR Technical Extended Range Trimix (1) and PSAI Trimix Fundamentals (1). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.
