Independent course guide · References checked 30 September 2026. Confirm current standards and your eligibility with an authorised instructor.
Where this course fits
A qualifying Advanced Diver with Deep specialty, Intro to Tech or equivalent route, plus Advanced Nitrox and experience requirements apply. Advanced Nitrox may be combined where permitted; confirm current standards.
Ask the instructor to explain the exact route, prerequisite evidence and limits of the certification offered.
TDI Helitrox Diver: learning scope
Entry & preparation
A qualifying Advanced Diver with Deep specialty, Intro to Tech or equivalent route, plus Advanced Nitrox and experience requirements apply. Advanced Nitrox may be combined where permitted; confirm current standards.
What you study
Introduce helium-containing gas use within a defined technical diving scope.
- Helium-related planning
- Gas analysis and identification
- Decompression and team procedures within scope
Qualification boundary
Helitrox is not unrestricted trimix qualification. Its gas and depth boundaries remain important.
A visual summary of this independent course guide. Confirm current prerequisites and standards with the agency and instructor.
What the training focuses on
| Learning area | Discuss before booking |
|---|---|
| Helium-related planning | How will this be taught and assessed? |
| Gas analysis and identification | What preparation and equipment should I bring? |
| Decompression and team procedures within scope | What happens if I need more practice? |
Understand the qualification’s scope
Helitrox is not unrestricted trimix qualification. Its gas and depth boundaries remain important.
Frequently asked questions
Why add helium?
Appropriate helium use can reduce narcotic exposure, but introduces additional planning requirements.
Is it the same as Advanced Trimix?
No. These are different training scopes and experience levels.
Can I choose a mixture from this website?
No. Gas selection belongs in qualified instruction and a complete dive plan.
What should an Australian course quote include?
Ask for an itemised total covering learning materials, practical sessions, certification, equipment, boat or site fees and any extra training. Availability, duration and prices are centre-specific.
Where do I confirm the latest prerequisites?
Use the official TDI information linked below and ask the authorised instructor to check your certification, age, experience, medical and first-aid records. A similar course name from another agency is not automatic equivalence.
Official course information
TDI: Helitrox Diver ↗Agency standards determine certification requirements. This guide does not reproduce the full standard or imply agency endorsement.
Related next steps
Check prerequisites and readiness before choosing another course.