Level 4

Mixed Gas CCR Decompression Course (Trimix)

Closed Circuit Rebreather Training for Certified Technical Divers

This course focuses on the use of mixed gases for deep and complex CCR dives.

It integrates advanced decompression modeling, gas blending (trimix and other blends), and multi-stage dive planning. Divers refine their technical control, develop risk mitigation strategies, and master operational readiness for challenging underwater environments. The program emphasizes precision, safety, and professional-level CCR proficiency for deep diving operations.

What you'll learn

Planning and conducting deep mixed gas CCR dives.
Advanced decompression strategies and contingency plans.
Complex gas blending and switching operations.
Leading multi-stage deep diving operations safely.
System checks and post-dive maintenance.
CCR setup for deep dives, including mixed gas theory and calculations.

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Requirements

Please contact us for questions or clarification about course eligibility.

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25 dives/ 25 hours on set

+ 50hrs on another TDI-recognized set

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50 dives + 50hrs CCR

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TDI-recognised CCR Certificate

Nitrox, Deco Procedures or Helitrox

Register your interest

Register your interest in DEEP's CCR Level 4 course for 2027.
We'll be in touch with more information, including upcoming course dates and availability.