As your motivation to explore progresses you will find that you may want to go deeper to dive that wreck that is part of history or that cave system that you have read so much about.  One of the major limiting factors of going deeper is narcosis; TDI’s Trimix Diver course shows how to minimize the effects of narcosis by adding helium to offset the nitrogen in your breathing gas. While taking the Trimix Diver course your TDI Instructor will teach you how to plan and execute dives utilizing as little as 18 percent oxygen and diving to maximum depth of 60 m/200 feet with a blend of helium appropriate for the planned depth.
The course covers topics and skills likeDive team planning
Gas matching
Cylinder labeling
Surface marker deployment
Equipment configuration
Thermal protection options

Open Water Execution: 

1. Four decompression dives are required with a minimum accumulated bottom time of 100 minutes 

2. Two of the dives should be deeper than 40 metros / 130 feet 

Required Equipment 

The following equipment is required for each student: 

1. Bottom mix cylinder(s) 

a. Cylinder volume appropriate to complete all planned decompression on bottom mix 

b. Dual outlet valve, double manifold or independent doubles 

c. Labeled in accordance with TDI Standards 

2. Decompression mix cylinder(s) 

a. Cylinder volume should contain a minimum of 1.5 times the gas required for the planned decompression 

b. Labeled in accordance with TDI Standards 

3. Suit inflation cylinder, required for dry suit divers only 

4. Regulators 

a. Primary and primary redundant required on all bottom mix cylinder(s) 

b. Submersible pressure gauges are required on all primary / bottom mix cylinders 

c. A contingency use long hose second stage should be designated and appropriately rigged to facilitate air sharing at depth if necessary 

d. It is strongly recommended that the 3 required regulators be all DIN or all yoke 

5. Buoyancy compensator device(s) (BCD) adequate for equipment configuration 

6. Redundant depth and timing devices 

7. Air decompression computers are allowed for use as depth and timing devices, provided they have a gauge mode 

8. Redundant light system if required by site 

9. Ascent reel with lift bag/surface marker buoy 

a. Adequate for maximum planned depth 

b. Minimum of 23 kg / 50 lb lift bag; a dump valve highly recommended 

10. Exposure suit adequate for the open water environment 

11. Line cutting device 

12. Underwater slate, (for decompression / contingency tables 

13. Helium analyzer, recommended 

Student Prerequisites 

1. Minimum age 18 

2. Minimum certification as a TDI Advanced Nitrox Diver and TDI Decompression Procedures Diver, or equivalent 

3. Provide proof of a minimum 100 logged dives 

© Aquatech Productions 2013