TDI Helitrox CCR Diver
Introduce helium into CCR diving, reduce narcosis, and execute controlled decompression dives with precision
Duration
7 days, 7 dives
Max Depth
45m / 150ft
Level
Technical (CCR Intermediate – Helitrox)
Next Step
TDI Mixed Gas CCR
Overview
The TDI Helitrox CCR Diver course introduces the use of helium-based diluent gases in closed circuit rebreather diving, bridging the gap between air diluent CCR and full trimix CCR.
By adding helium, divers reduce narcosis and improve clarity at depth, while learning to manage formal decompression diving using a CCR system.
Training focuses on gas planning, PO₂ control, decompression execution, and bailout strategy, where precision and discipline are critical.
At N9BO℠, this course is delivered as progressive CCR training, developing control, awareness, and execution under increasing depth and decompression requirements.
Course Facts
- Course name: TDI Helitrox Closed Circuit Rebreather Diver (Unit Specific)
- Level: Technical CCR (helitrox / decompression level)
- Minimum prerequisites: Minimum age 18, Minimum 30 CCR dives / 30 hours on unit, TDI Air Diluent CCR Diver (or equivalent)
- Ratio: Maximum of 3 students per instructor (small groups recommended for quality training)
- Configuration: Unit-specific CCR with helitrox diluent and bailout system
- Depth / environment: Maximum depth 45m / 150ft, Helitrox diluent with Max ~35% helium (+/-5%), Min 20% oxygen, Up to 100% O₂ for decompression
- Format: Academic development + unit workshop + confined water + open water dives
- Duration: Typically completed in 7 days (Minimum 7 open water dives with at least 420 minutes accumulated bottom time)
What You’ll Learn
- Plan and execute CCR dives using helitrox diluent.
- Manage Equivalent Narcosis Depth (END).
- Execute formal staged decompression dives.
- Control PO₂ setpoints throughout dive phases.
- Execute bailout from depth including decompression on open circuit.
Prerequisites
- Be at least 18 years old.
- Have a minimum of 30 logged dives / 30 hours on the unit.
- Hold TDI Air Diluent CCR Diver (or equivalent).
- Be medically fit for diving.
FAQ
Helitrox is a trimix blend with limited helium (typically up to ~35%), used to reduce narcosis while maintaining manageable decompression profiles.
You are certified to a maximum of 45 metres / 150 feet, using helitrox diluent and formal decompression procedures.
You must complete a minimum of:
- 7 open water dives
- 420 minutes total bottom time
This course introduces:
- Helium-based gas planning
- Increased depth beyond 40m
- Mandatory decompression diving
- More complex bailout scenarios
You are qualified to conduct unit-specific CCR dives using helitrox diluent, managing decompression obligations, helium-based gas planning, and bailout procedures within your training limits.
Ready to Add Helium to Your CCR Diving?
Send us your CCR experience and certifications. We’ll train you to integrate helium safely and execute decompression dives with precision and control.
Go Pro with Helitrox CCR Instructor
Advance into CCR instruction and train divers to integrate helium, manage decompression, and operate life-support systems at an advanced technical level.
