TDI Trimix Diver
Trimix, the portal to clarity.
Cleaner decisions. Safer execution.
The TDI Trimix Diver course in Playa del Carmen with Divers UnderGround trains you to use helium-based breathing gases safely and competently for staged decompression dives, including decompression with nitrox and/or oxygen. You’ll cover the benefits, hazards, and “do it right” workflows, because depth isn’t the goal; control is.
Prerequisites:
Required Certifications:
- TDI Advanced Nitrox Diver.
- TDI Decompression Procedures Diver.
Plus
- 18 Years old
- 100 logged dives
Why train with Divers UnderGround?
What you can do with this Certification
All within a fun, professional, and safe setting. You’ll train through real-world simulations, on land and underwater, applying from day one everything you need to become a dependable and confident Trimix diver.
TRUE EXPLORATION ISN’T JUST ABOUT CROSSING THE THRESHOLD, IT’S ABOUT COMING BACK TRANSFORMED.
What Skills
Will You Learn?
- Plan trimix decompression dives with structure: build a clear run-time, stops, and team roles so the dive stays predictable.
- Analyze and verify every breathing gas you will use: confirm mixes before the dive and keep gas selection error-proof.
- Execute clean gas switches with your team: use a consistent confirmation routine at depth to prevent wrong-gas mistakes.
- Manage two stage/deco cylinders efficiently: carry, stow, drop and recover cylinders without losing buoyancy, trim, or position.
- Hold precise buoyancy and stable hovering: stay fixed in the water column without controlled “drift,” even while task-loaded.
- Build a contingency decompression plan if a deco gas is lost: adjust the schedule calmly and keep decisions grounded.
Course Details
Duration:
Minimum 3 days but we move at your pace.Take the time you need to feel confident and secure.
Dives:
- Five Dives:
* Four Deco Dives with Tx
* Two below 40 m/130 ft.
- All Dives 30 to 60 m/100 to 200 ft.
- Gases: >18% O2 < 30 m END
Format:
E-learning independent study, theoretical sessions, dive briefings and debriefings, and in-water drills with continuous feedback
Certification:
TDI Trimix Diver
Training per day
USD 325
- Transportation from Playa del Carmen
- Nitrox 32%
- Cenote entrance fees
- Water, lunch, and snacks
E-learning Materials
USD 155
Digital Certification
USD 30
Optional: Add an extra day for technical skill reinforcement or fun diving/practice in the caves** or the Ocean.
**Must be Full Cave Certified
The eLearning material and the certification fees are not included and must be paid separately.
Helium and high O2 mixes are not included in the price.
To get the most out of your time with us, we recommend starting with the eLearning program before your in-water sessions. The certification fee is paid at the end of your training, once all requirements are met.
RELATED
COURSES
Yes, it’s technical. Yes, it’s demanding. But you’ve got to have fun!
TDI Advanced Nitrox
TDI Decompression Procedures
TDI Extended Range
