Who this course is for:
- Technical divers who have completed decompression procedures training and want to extend their depth range safely, divers interested in reducing nitrogen narcosis effects at depth, and those looking to advance their technical diving education to deeper environments.
Course schedule (5 to 6 days in total, 4 diving days):
| Session | Details |
|---|---|
| Day 0 | Theory & gear configuration (1 to 2 evenings) |
| Day 1 | Check dive & gear familiarization |
| Day 2 | Max depth 45m |
| Day 3 | Max depth 50m |
| Day 4 | Max depth 60m |
Course prerequisites:
- Minimum age 18
- TDI Decompression Procedures Diver or equivalent certification
- TDI Advanced Nitrox Diver or equivalent certification
- Proof of 100 logged dives with at least 20 dives deeper than 30 metres/100 feet
- Proof of 25 logged decompression dives
What you can expect to learn:
- Trimix theory and gas planning including:
- Helium properties and physiological effects
- Gas density considerations at depth
- Trimix blending and gas management
- END (Equivalent Narcotic Depth) calculations
- Trimix diving procedures
- Multi-gas diving equipment configuration
- Gas switching procedures and protocols
- Deep diving team communication
- Ascent procedures with multiple decompression gases
- Emergency gas sharing at depth
- Thermal considerations for deep diving
- Advanced buoyancy control and trim at depth
- Deep diving emergency procedures (out-of-gas emergencies, equipment failures, rapid ascents, etc.)
- Dive planning software and decompression modeling for trimix dives
- Equipment selection and configuration for deep trimix diving
- Gas analysis and cylinder labeling procedures
TDI Trimix Diver minimum certification requirements:
- Satisfactorily complete the written examination with a minimum score of 80%
- Complete all open water requirements safely and efficiently
- Demonstrate mature, sound judgment concerning deep dive planning and execution
- Demonstrate proper gas switching and emergency procedures
- Show mastery of buoyancy control and team awareness at depth
Required Equipment:
- Primary cylinder in either double tank or sidemount configuration
- 2 stage/decompression cylinders, regulators with rigging systems
- Dry suit recommended
- 2 dive computers
- 2 surface marker buoys (SMB) and line reels of at least 1.5m
Course Inclusions:
- E-learning materials
- Certification fee
- Theory sessions
- Equipment configuration instruction
- Instructor fees
- Insurance
Course Exclusions:
- Equipment rental
- Gas costs (including instructor portion - shared by students attending the same course)
- Boat diving costs (including instructor portion - shared by students attending the same course)
- Amounts depend on suppliers and dive sites
For detailed course standards, please check out the TDI Trimix Diver Standards PDF.