TDI Advanced Mixed Gas CCR Diver
Operate at extreme depth, execute complex decompression profiles, and master CCR diving at the highest level
Duration
7 days, 7 dives
Max Depth
100m / 330ft
Level
Technical (CCR Expedition Level – Advanced Trimix)
Next Step
Expedition / Exploration Diving
Overview
The TDI Advanced Mixed Gas CCR Diver course is the highest level of CCR training, designed for divers operating at extreme depths using trimix-based diluent gases.
This program builds on all previous CCR training, integrating deep helium-based diving, advanced decompression strategy, and full system failure management under high task loading.
Divers learn to manage complex dive planning, extended decompression obligations, multiple bailout systems, and advanced failure scenarios, where precision and discipline are critical.
At N9BO℠, this course is delivered as elite-level operational training, preparing divers for deep technical exploration and expedition-level diving.
Course Facts
- Course name: TDI Advanced Mixed Gas Closed Circuit Rebreather Diver (Unit Specific)
- Level: Technical CCR (advanced / expedition level)
- Minimum prerequisites: Minimum age 18, Minimum 100 CCR dives / 100 hours on unit, TDI Mixed Gas CCR Diver (or equivalent)
- Ratio: Maximum of 2 students per instructor (small groups recommended for quality training)
- Configuration: Unit-specific CCR with trimix diluent, multiple bailout cylinders (minimum 3), advanced decompression setup
- Depth / environment: Maximum depth 100m / 330ft, All mixed gas dives conducted deeper than 40m / 130ft, Multiple deep decompression dives required
- Format: Academic development + unit workshop + deep mixed gas CCR 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 deep trimix CCR dives to 100m.
- Manage Equivalent Narcosis Depth (END) and helium fractions.
- Execute multi-stage decompression with extended obligations.
- Control PO₂ setpoints across deep and decompression phases.
- Execute deep bailout and ascent procedures under load.
Prerequisites
- Be at least 18 years old.
- Have a minimum of 100 logged dives / 100 hours on the unit.
- Hold TDI Mixed Gas CCR Diver (or equivalent).
- Experience with deep dives and decompression.
- Be medically fit for diving.
FAQ
This is the final level of CCR training, enabling divers to conduct:
- Deep trimix dives
- Extended decompression profiles
- Expedition-level technical dives
You are certified to a maximum of 100 metres / 330 feet, using trimix diluent and full decompression procedures.
This course introduces:
- Depth beyond 60m
- High helium fractions
- Long decompression obligations
- Advanced failure management under extreme conditions
- Oxygen toxicity at depth
- Hypoxia due to system failure
- CO₂ buildup
- Complex bailout management at extreme depth
You are qualified to conduct unit-specific CCR dives using trimix diluent to extreme depths, managing complex decompression profiles, multiple bailout systems, and advanced failure scenarios within your training limits.
Ready for Extreme CCR Diving?
Send us your CCR experience and dive history. We’ll train you to operate at depth with precision, discipline, and full system mastery.
Go Pro with Advanced Mixed Gas CCR Instructor
Advance into the highest level of technical instruction and train divers in deep CCR trimix operations, decompression strategy, and life-support system mastery.
