The Tec Trimix 65 course opens up the advantages of trimix diving, and upon completion divers are able to make multi-stop decompression dives that employ EANx and oxygen for accelerated decompression, and any trimix with an oxygen content of 18% or more. This can be done to a maximum of 65m/210feet. The course extends your depth range capabilities by training you to use trimix (a blend of helium, oxygen and nitrogen).During the course you will plan and execute at least 5 trimix decompression dives using different trimix blends, the training dives will be made to depths of 65m/210feet. You will also use decompression software to create custom dive tables and plan dives. Throughout the course the following topics will be covered:
* Trimix diving depth ranges
* Exposure planning
* Selecting a mix
* Argon inflation systems
* Handling three or four decompression cylinders
* Decompression models
* Emergency procedures
* Face masks and multi-gas computers.
Equipment Required: 
- Double cylinders (minimum 12 litre/70 cubic feet each, with larger preferred) with isolator manifold
- Primary and secondary regulators, one with two metre/seven foot hose (approximately) for gas sharing, and one with SPG
- Stage/decompression cylinders with regulator, SPG, mounting hardware and proper labeling/markings. Two per diver will be required
- Backup decompression cylinders as appropriate and required for the environment
- BCD and harness – redundant buoyancy control is required (double bladder BCD or dry suit if suitable for weight of equipment worn)
- Depth gauge/computer and backup depth gauge/computer
- Timing device and backup timing device
- Trimix decompression information (tables/trimix computer) and backup decompression information
- Exposure suit appropriate for environment and dive duration. (If you use a dry suit, you should be trained/experienced with its use in recreational and technical diving prior to using it for trimix training or diving.)
- Argon dry suit inflation or other inflation system as needed
- Weight system (if needed)
- Jon line (if needed for current diving environments)
- Inflatable signal tube
- Reel
- Lift bag (bright yellow or per local community practice preferred)
- Dive knife / cutting device and backup slate, backup mask (optional)
- Compass, lights (optional)
- Drift kit (if drift decompressing)
Prerequisites for the Trimix 65 course, you must:
- Be a PADI Rescue Diver (or hold a qualifying certification from another organization and having proof of CPR and first aid training with the previous two years).
- Be certified as a Tec 50 (or hold a qualifying certification from another organization)
- Be at least 18 years old
- Have logged at least 100 dives
- Have a medical form signed by your physician
