Sidemount Trimix Diver qualifies staged decompression dives to 60 m / 200 ft using custom helium blends carried in sidemount configuration. TDI Trimix requires Advanced Nitrox and Decompression Procedures foundations, one hundred logged dives and four trimix deco dives with at least two deeper than 40 m. This is expedition-style task loading, not a weekend novelty dive.
Gas mixes use minimum 18% oxygen and target an END of at least 30 m / 100 ft. You manage multiple sidemount cylinders and stage bottles while executing switches, valve shutdowns and long deco hangs with team discipline. RAID and IANTD teach parallel sidemount trimix applications with similar depth envelopes. Trimix is expensive, cold and unforgiving. Students who arrive underprepared on sidemount deco make the course harder than it needs to be. That is normal when prerequisites were rushed, not a failure of the student forever.
Compare back-mounted PSAI or TDI Trimix pathways if you have not committed to sidemount long term. Leave a comment when you book with trimix-relevant logbook summary.
Sidemount Trimix is assessed through written examination and open water trimix dives to certification standards. Combined sidemount and trimix programmes must meet both standard sets.
Quick answers about this qualification. For anything else, use live chat or browse bookable activities below.
Find activitiesIt is full trimix staged decompression training to 60 m / 200 ft executed in sidemount configuration with custom helium blends and multiple deco gases.
You must already be a competent sidemount deco diver before helium bottom mixes are added at this level.
TDI requires Advanced Nitrox, Decompression Procedures, one hundred logged dives and sidemount competence. Centres review deco and sidemount hours from logbooks.
Leave a comment when you book with deepest dives, deco count and sidemount experience summary.
TDI Trimix certifies staged decompression trimix dives to 60 m / 200 ft with minimum 18% oxygen and minimum END 30 m / 100 ft on bottom mixes.
The card is not permission to dive to 60 m on every outing without experience ramp-up afterward.
TDI Trimix requires four decompression dives using trimix bottom gas with one hundred minutes accumulated bottom time and two dives deeper than 40 m.
Sidemount competency dives may add to the calendar when taught as an integrated programme.
PSAI Trimix Fundamentals and TDI Trimix share similar 60 m ceilings and helium planning culture. This listing certifies sidemount execution rather than back-mounted twins only.
Gas maths overlaps; configuration skills differ. Pick the pathway you will actually dive.
Many divers complete Sidemount Helitrox or back-mounted Helitrox before trimix, building helium and deco hours gradually.
Direct entry depends on logbook depth, deco experience and centre assessment, not enthusiasm alone.
Typically three to five days with four or more trimix dives. Gas blending and weather slip schedules on technical charters.
Trimix courses are full days with long debriefs. That is normal, not the centre running late.
Helium fills, multiple stages and boat time make sidemount trimix costly beyond the base course fee. Budget gas surcharges when comparing listings.
Ask centres for typical fill costs per training day so surprises land before you travel, not on the dock.
Sidemount harness, wing, sufficient regulators for bottom and deco gases, multi-gas computer, reels and SMBs rated for depth, plus exposure suit for long stops.
Rental is common. Owning well-fitted sidemount kit you trust helps on deep deco hangs.
Build slow logged trimix experience on planned profiles before advanced wreck, cave or expedition programmes your agency offers.
Depth credentials matter less than repetitive team discipline and conservative gas planning after certification.
adventuro lists technical centres teaching sidemount trimix with helium blending and sites suited to 40 to 60 m training dives. Compare instructor experience, gas policies and minimum logbook rules.
Leave a comment when you book with your full technical certification stack for entry confirmation before deposit.
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