Trimix | Underwater Explorers

SAFELY GOING DEEPER

Please Note: As we only conduct technical training in sea conditions which makes it weather and wind dependent as well as requiring proper boat dive availability, dives deeper than 30 metres are conducted from April onwards only. If you are looking to do helitrox or trimix level training before April or in the following months, we advise you to seek training with instructors who conduct courses year-round and utilise inland sites. For advice or recommendations please don't hesitate to contact us.

The TDI Trimix Course (dubbed Normoxic Trimix) provides the training required to competently and safely utilize breathing gases containing helium for dives that require staged decompression, utilizing Nitrox and/or oxygen mixtures during decompression to a maximum depth of sixty (60) metres.

tdi.trimix The objective of this course is to train divers in the benefits, hazards and proper procedures of utilizing custom oxygen/helium/nitrogen mixtures as breathing gases. Gas mixes used on this course and at this certification level are not to have any less than eighteen (18%) percent O2 and the maximum diving depth is 60 metres. Underwater Explorers does not exceed an END of 30m at any depth of training.

The course is normally run over 4 consecutive days (or two weekends). A minimum of 4 training dives are required for successful completion. Underwater Explorers might require candidates to do a assessment dive with the course instructor prior to taking any bookings. The course fee includes required course manual and TDI certification fees. Boat fees and gas fills are not included. As on all higher level technical courses, instructor boat fees and gas costs are shared between students.

PREREQUISITES

Be a minimum age of eighteen (18).
Have a minimum certification as a TDI Advanced Nitrox Diver and Decompression Procedures Diver (or equivalent).
Show proof of a minimum of one hundred (100) logged dives (25 deco dives deeper than 30m recommended)

Download the TDI Trimix Course Standards

EQUIPMENT REQUIREMENTS

O2 clean Twin Set for Bottom Mix
O2 clean Stage Cylinder(s) for decompression
Separate Suit Inflation Cylinder (Argon cylinder)
Primary and primary redundant required on all bottom mix cylinder(s).
Submersible pressure gauges are required on all primary / bottom mix cylinders.
A contingency use long hose second stage should be designated and appropriately rigged to facilitate air sharing at depth if necessary.
It is strongly recommended that three (3) required regulators be all DIN or all yoke.
Buoyancy Compensator(s) adequate for equipment configuration.
Redundant Depth and Timing Devices.
Air decompression computers allowed for use as depth and timing devices.
Primary and Redundant Light System.
Ascent Reel (100m line) with Lift Bag/Surface Marker Buoy
Back-up Reel and SMB
Exposure suit adequate for the open water environment - Dry Suit
Line Cutting Device.
Underwater Slate or Note Pad

Underwater Explorers is able to provide some of the required equipment for the duration of course free of charge (subject to availability).

PERFORMANCE REQUIREMENTS

Demonstrate familiarity with basic and intermediate hand signals.
Select and prepare of equipment suitable for soft overhead environment with long decompression obligations.
Conduct team oriented drills for SMB deployment and 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 and other team members through communications, proximity and team oriented dive practices.
Demonstrate competence managing two stage cylinders including drop and recovery while maintaining position in the water column.
Demonstrate ability to confirm gas switches at depth with team members.
Demonstrate SMB deployment from depth and 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 and efficiently.
Demonstrate mature, sound judgment concerning dive planning and execution.