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Tec Trimix 65

Tec Trimix 65 Course

This course opens up the advantages of trimix to the diver, and divers are qualified 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. 

They can dive to a maximum depth of 65 metres/210 feet. 

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What You'll Learn

The PADI Tec Trimix 65 course is intended to extend the depth range of technical divers already trained and qualified to use air, enriched air and oxygen for technical decompression dives beyond 50 metres /165 feet. 

This course is for Tec 50 divers (or those holding a qualifying certification from another training organization). The course extends your depth range capabilities by training you to use trimix (a blend of helium, oxygen and nitrogen). 

You will:

  • Plan and execute at least five dives using EANx and trimix blends
  • Use decompression software to create custom dive tables and dive plans
  • Make training dives as deep as 65 metres/210 feet 

Scuba Gear You'll Use

  • 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) 

Learning Materials You'll Need

Tec Trimix Diver Crew-Pak - this includes all therequired materials,  including: manual, deep stop calculation table, trimix decal and emergency procedures slate. 

Topics covered include:

  • 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. 


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. 




Various dates and training weekends plus trips available throughout the year.
Please call us to book your course on 01924 444888



Take the Tec Trimix 65 course

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