TDI Trimix Diver Course
Push the limits. See the depths with complete clarity.
TDI Trimix Diver
The TDI Trimix course provides the training required to competently and safely utilise breathing gases containing helium for dives that require staged decompression, utilising nitrox and oxygen mixtures during decompression to a maximum depth of 60 Metres.
The objective of this course is to train divers in the benefits, hazards, and proper procedures of utilising custom oxygen/helium/nitrogen mixtures as breathing gases.
Gas mixes are not to have any less than 18 percent oxygen (O₂) and a minimum END of 30 metres/100 feet.
The training encompasses essential aspects such as equipment requirements, setup, and decompression planning and techniques.
This comprehensive training ensures that divers are well-
prepared to manage the complexities of Trimix diving with heightened safety and efficiency.
Who Is This Course For:
Certified Advanced Nitrox and Decompression Procedures divers who want to:
- Go deeper than their current limits
- Experience less narcosis on deep dives
- Improve their technical diving skills
Course Prerequisites:
- Minimum Age: 18 years
- Minimum Certification: TDI Advanced Nitrox and Decompression Procedures Diver (or equivalent)
- At least 100 logged dives
What You Can Expect To Learn:
Advanced decompression dive planning, including:
- Gas planning using equal narcotic depths, nitrogen and helium loading and release, CNS and OTU limits, isobaric counter diffusion, gas volume requirements, and more
- Proper decompression Choosing Gases
- Using a Dive Table vs. a Personal Dive Computer
- Emergency and Backup Planning
- Decompression Diving Methods
- Equipment Selection and Setup
- Pre-Dive Checks and Practice Drills
- Stress Control and Stress Reduction
- Following a Planned Decompression Profile
- Safe Gas Switching
- Team Focus and Clear Communication
- Using SMBs and Lift Bags
- Proper Trim, Bounce, and Fin Techniques
- Managing Multiple Stages and Decompression Cylinders
- Emergency Actions
- Equipment Setup, Tank Labeling, Gas Analysis for Trimix and Nitrox, and Basic Gas Mixing Steps
What’s In It For You?
You gain technical diving skills using custom trimix gases without direct supervision, as long as:
- Your dives remain similar to your training dives
- Dive locations match your training environment
- Conditions remain close to what you learned in training
You are also eligible to join:
- TDI Advanced Wreck Course
- TDI Advanced Trimix Course
TDI Trimix Diver Minimum Certification Requirements:
- Pass the TDI Trimix Diver Written Exam
- Complete all open water dives safely and smoothly
- Demonstrate calm thinking and smart decision-making during dive planning and execution
How To Take This Course!
- Online course available: Start e-learning today
- Find an instructor for this course
- Find your local dive center: here
Frequently Asked Questions
Why is helium used in trimix?
Helium reduces the effects of nitrogen narcosis and increases mental clarity at depth, making deep exploration safer and more controlled.
Can trimiks be used recreationally?
Trimiks are a tool reserved for trained technical divers but when used correctly, they are very effective in improving safety levels during deep dives.
What is the maximum diving depth after certification?
Up to a depth of 60 meters / 200 feet, with a gas mixture of 18 percent oxygen or higher.
How many diving lessons does the course include?
It usually includes several deep training dives that include staged decompression, skill-circuits and gas-switching training.
What equipment do I need?
Sidemount or twinset configuration, multi-stage cylinders, redundant regulators, reels/SMB and technical trimix-capable computers. A full description and explanation of the equipment will be provided during your orientation.
Are You Ready to Dive Deeper Than Ever Before?
Go beyond classic limits and master deep-sea exploration with Trimix.
Become the diver who goes where few can
Start your Trimix training today Join Blue Water Ascent’s elite community of technical divers. Unlock 60 meters / 200 feet with clarity, confidence and control.
