* 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