The TDI Helitrox Diver Course examines the theory, methods, and procedures for planning staged decompression dives utilizing helium in the breathing mixture to reduce the effects of inert gas narcosis.

The TDI Helitrox Diver Course trains divers how to plan and conduct staged decompression dives to a maximum depth of 45 metres/150 feet. The most common equipment requirements, gear set-up, and decompression techniques are also presented during this course. Students are permitted to utilize enriched air nitrox and helium mixes with no greater than 35% helium content, and up to 100% oxygen for decompression diving.

This program is designed as a stand-alone course, or it may be taught in conjunction with TDI Advanced Nitrox at the discretion of the instructor.

The Training

The TDI Helitrox Course includes three parts:

  • Online learning – once you have signed up for the course, we will provide you a code to sign up for the online learning in advance of your practical training to work through at home. You will then go through key areas in greater detail with your instructor and cover areas such as plus many others:
    • Dive tables vs computers 
    • Dive tables and planning
    • Equipment Considerations
    • Decompression Options
  • Classroom training – After you have reviewed the key knowledge areas and ready to go you will then join your instructor for the practical element of your training and cover the following areas:
    • Conduct team orientated drills
    • Gas Matching among buddy team
    • Familiarity with hand signals, gas switching and lift bag deployment
    • Pre-dive planning procedures
  • Open Water Training – After you have covered the key knowledge through the online learning, you will then join your instructor for 4 open water dives where you will cover the following plus much more:
    • Staging cylinders
    • Responding to emergency scenarios such as gas loss, omitted decompression and assisting a buddy member in distress
    • Executing complex dive plans and creating contingency dive plans through a decompression schedule
    • Conservative gas management, gas switching and gas sharing


  • Age: 18 years old and above
  • SDI Advanced Adventure Diver and above, or equivalent from an alternative agency
  • SDI Deep Diver or TDI intro to Tec and above, or equivalent from an alternative agency
  • TDI Advanced Nitrox Diver and above, or equivalent, from an alternative agency (or completing TDI Advanced Nitrox alongside this course)
  •  Minimum of 50 logged dives 
  • Good physical health – You will need to fill out a self certification medical statement. If you have any medical conditions you think may prevent you from scuba diving please feel free to contact us




  • Online learning materials + certification
  • Cylinders (gases additional due to changing cost of Helium)
  • 4 Open Water Dives
  • Transport to and from dive sites
  • 10% off Aqualung + APEKS dive accessories

Contact us for further details