Trimix Diver course: 4 days, 4 dives, to 100 m

Why take the Trimix Diver course?

If you are drawn to the unexplored edges of underwater exploration, depths beyond 60 m (200 ft), the Trimix course is your next step. These advanced dives demand more than just experience. They take a resilient mindset, precise gas planning and mastery of multiple decompression strategies. Many uncharted dive sites remain inaccessible to divers limited by air or normoxic Trimix. Becoming a certified Trimix Diver lets you go deeper safely, opening doors to exploration, scientific projects and discovery-driven missions. The Trimix course is for highly motivated divers. They are ready to commit to the highest level of training in open-circuit deep diving.

Who is it for?

The course is for experienced technical divers who want to expand their depth range. They also improve their ability to manage complex gas mixes, including hypoxic Trimix and multiple decompression gases. The course prepares divers to dive to 100 m (333 ft) with three or more decompression and stage cylinders. At the same time they keep safe decompression practices and efficient gas management. You should already be fully confident in technical dive procedures, buoyancy, equipment handling and team protocols.

What will I learn?

• Planning and conducting dives to 100 m (333 ft)
• Use of hypoxic Trimix and helium-rich breathing gases
• Handling multiple stage and decompression cylinders, three and more
• Gas switching, gas management and oxygen exposure protocols
• Extended and accelerated decompression strategies; omitted decompression and in-water problem solving
• Dive planning, failure management and team coordination at depth

The course blends theory, land-based skills and in-water practice to build a solid foundation for extreme-depth diving.

How the Trimix course runs

• 4 days, at least 4 dives including deep Trimix dives, 330 minutes underwater. 20 hours of combined instruction, classroom and in-water. The deep ocean dives of the course are from a private boat in Akumal. Transfer from Playa del Carmen included. Open circuit to 100 m; deeper only on rebreathers.
• Rate: $348 per training day in a group of two or more, $398 individually.

Included: professional Advanced Technical Dual CCR Cave Diving instructor, hotel pickup and drop-off in Playa del Carmen, doubles or sidemount tanks with EAN32, weights, and the final examination

Not included: Students must bring their own tech/cave level diving gear (requirements will be provided) or rent it, Additional sets of Doubles or Sidemount tanks with EAN32, Stages, Drysuit tanks, Sofnolime, Oxygen, Trimix or Argon fills for both students and Instructor / DPV rental for students and Instructor / Cenote entry fee / Any Rental equipment will be charged accordingly, Foto/Video service, Diving insurance, Camera fee (depend on Cenote policy), Fuel or boat surcharges for remote locations out of Playa del Carmen and Puerto Aventuras areas (as per student request), eLearning materials or/and printed manuals, Certification fee ($60 per card), Tips for instructor

• Boat: the deep ocean dives of the course are from a private boat in Akumal. $100 per dive on top of the course price, the same for one diver or four. A solo student pays the individual rate plus the boat.

Applicants must

• Be certified as Technical Diver, Technical Cave Diver or Normoxic Trimix Diver, or equivalent
• Be a minimum of 18 years of age
• Be physically and mentally fit and able to swim. Obtain a physician’s prior written authorization for prescription drugs or any medical condition that may pose a risk while diving
• Have a minimum of 200 logged dives. At least 25 of them between 42 m (140 ft) and 60 m (200 ft)

Equipment

All equipment is the student’s responsibility: bring your own or rent what is missing from Cave Ha, charged on actual usage. Sidemount AL80 DIN cylinders with technical regulators or backmount doubles AL80 DIN with technical regulators; in addition each diver needs 3 stage cylinders: 2 AL80 and 1 AL40, each with its own stage regulator. Planned gases: bottom gas EAN32, bottom stage gas EAN32, deco gas O2 in AL40. Students cover the cost of all gases and/or scrubber used by the instructor (above EAN32), cenote entrance fees or boat fees, certification card fees at $60 per card.

Required personal equipment

• 1 well-fitted drysuit with front-entry zipper, 2 pockets and 1 P-valve, plus 1 undergarment (Thinsulate 100-150 or equivalent), or 1 well-fitted wetsuit thick enough for 3-4 hours in the 25 C water daily (5-7 mm preferred) plus tech shorts with 2 pockets
• 1 thin neoprene hood; 1 pair of neoprene gloves of at least 1 mm
• 1 backmount doubles wing or sidemount BCD suitable for carrying 5 tanks
• 1 technical regulator set for backgas (2 first stages, 2 second stages, long hose, SPG, inflator hoses)
• 3 stage regulator sets; 2 stage rigging sets for AL80; 1 stage rigging set for AL40; 1 sidemount rigging set if using sidemount
• 1 primary light, canister type; 2 backup lights
• 1 bottom timer or deco computer; 1 wrist-mounted compass
• 1 pair of Jet fins; 1 primary mask plus 1 backup mask
• 1 small cutting device (for webbing harness)
• 3 to 4 safety/jump spools per person
• 1 wetnotes with pencil

Doubles or sidemount tanks with EAN32 are included in the course price. Rental: Tech SCUBA set $50 per day, stage AL80 with EAN32 $9, AL40 with oxygen $24, stage regulator $10 per day. Rental.

With three or more stage and deco cylinders. Rental of the course gases: Trimix 12/65 in an AL80 $257, Trimix 10/70 $273, deco stage with EAN50 $19, AL40 with oxygen $24. Rental.

Rules of the course

• Medical: every participant completes and signs the standard Diver Medical Participant Questionnaire before the activity. A YES answer to any question in its final section requires written approval from a physician before diving. Without it the guest does not dive.
• Liability: every participant signs the standard diving General Liability Release and Express Assumption of Risk before the activity. Without the signed form the guest does not dive.

Next step

• Deeper than 100 m: CCR Trimix Diver on a rebreather. CCR Trimix.