The TDI Trimix course provides the training required to competently & safely utilize breathing gases containing helium for dives that require staged decompression, utilizing nitrox &/or oxygen mixtures during
decompression to a maximum depth of 60 metres/200 feet. The objective of this course is to train divers in the benefits, hazards & proper procedures of utilizing custom oxygen/ helium/nitrogen mixtures as breathing gases.
Gas mixes are not to have any less than 18 percent oxygen (O2).
Minimum age of 18.
Minimum certification of TDI Advanced Nitrox Diver & Decompression Procedures Diver (or equivalent).
100 logged dives; 25 of these logged as decompresion dives deeper than 30m.
Dry suit exposure protection system.
O2 clean manifolded twin set
Back gas regulators: 2 first stages, suppling an SPG, BC inflation & 2 second stages, 1 second stage must be on a 1.5 - 2m hose.
Separate Suit Inflation Cylinder (Argon cylinder).
First stages & valves should be DIN.
Buoyancy Compenstor, stream lined in design & adequate for equipment configuration, ideally with rigid backplate & single piece harness.
2 x O2 clean Stage cylinder for decompression gas including 1 first stage, 1 second stage & SPG regulator configuration.
A primary & redundant light system.
2 x wrist mounted, time & depth measuring device.
1 wrist mount compass.
At least 1 cutting tool.
Underwater wet notes.
Primary & redundant surface marker buoys & Reels.
Rigid non spilt fins.
In Deep is able to provide all of the required equipment for hire for the duration of course, please note candidates must be familiar with the equipment they will be using for the course.
Demonstrate familiarity with basic & intermediate hand signals.
Select & prepare of equipment suitable for soft overhead environment with long decompression obligations.
Conduct team oriented drills for SMB deployment & gas switching procedure.
Drills for buddy rescue
Demonstrate buoyancy control (ability to hover at fixed position in water column without moving hands or feet).
Show good awareness of buddy & other team members through communications, proximity & team oriented dive practices.
Demonstrate competence managing two stage cylinders including drop & recovery while maintaining position in the water column.
Demonstrate ability to confirm gas switches at depth with team members.
Demonstrate SMB deployment from depth & use of SMB as back-up buoyancy device.
Demonstrate air-sharing ascent from depth while one member of buddy team is without mask.
Create contingency decompression schedule after simulated loss of decompression gas.
Demonstrate ability to manage multiple failures simultaneously.
Demonstrate controlled ascent with simulated toxed diver including surface tow at least 30 meters with gear removal on surface.
Complete a horizontal breath hold swim at depth for 15 meters with mask off or blacked out.
Satisfactorily complete the TDI Trimix Course written examination.
Complete all open water requirements safely & efficiently.
Demonstrate mature, sound judgment concerning dive planning & execution.
Please Note: Course prices inclusive of materials & certification fees. Students are expected to cover their own gas costs, boat charter, transportation, accodomation (if applicable), equipment hire (if applicable) & quarry entry fees (if applicable) & contribute towards instructors costs.