TDI Mixed Gas CCR Diver – rEvo Rebreather Training

The TDI Mixed Gas Closed Circuit Rebreather Diver Course is an advanced technical diving program designed for experienced rebreather divers who want to expand their capabilities by using helium-based breathing gases during CCR dives.

This course is conducted using the rEvo Closed Circuit Rebreather, a highly respected CCR system known for its dual scrubber design, reliability, and efficient gas management.

Mixed gas CCR diving uses trimix (helium, oxygen, and nitrogen) as the diluent gas. The addition of helium reduces nitrogen narcosis and allows divers to safely conduct deeper dives while maintaining better mental clarity and control underwater.

During the course, divers learn how to plan and execute deep decompression dives using trimix diluent while managing multiple gases, decompression obligations, and emergency procedures.

Training dives are conducted to a maximum depth of approximately 60 m / 200 ft, while practicing advanced dive planning, gas management, and CCR system control.

The TDI Mixed Gas CCR Diver course represents the next step in advanced rebreather training and prepares divers for deeper technical diving exploration.

Course Price

$2500 per student

Included

• Academic theory training

• rEvo CCR system configuration workshops

• Mixed gas dive planning sessions

• Confined water skill development

• Open water CCR mixed gas training dives

• Professional technical diving instructor guidance

Not Included

• TDI eLearning materials: $140

• Helium and diluent gas fills

• CO₂ absorbent materials

• Rebreather equipment rental

Course Schedule

Typical course duration: 4–5 days

Training includes:

• Classroom / theory sessions

• Rebreather system drills and checklists

• Mixed gas dive planning exercises

• Multiple open water CCR mixed gas training dives

Students will practice advanced CCR procedures, gas management, decompression planning, and emergency drills.

Training Standards

Minimum Age

18 years old

Maximum Training Depth

60 meters / 200 feet

Prerequisites

• Certified TDI Air Diluent CCR Decompression Procedures Diver or equivalent

• Minimum 50 CCR dives and 50 hours on a rebreather

• Experience on the specific CCR unit used during training

These requirements ensure divers have sufficient CCR experience before conducting deep mixed-gas dives. 

What You Will Learn

During this course you will learn:

• Trimix gas planning and calculations

• CCR mixed-gas decompression procedures

• Equivalent narcotic depth (END) planning

• Advanced rebreather equipment configuration

• Gas switching and bailout planning

• Emergency procedures during deep CCR dives

These skills allow divers to safely conduct deeper technical dives using helium-based breathing gases.

Certification

After successfully completing the course, students will receive the TDI Mixed Gas Closed Circuit Rebreather Diver certification for the rEvo unit.

Graduates may conduct CCR mixed-gas decompression dives up to 60 m / 200 ft within the limits of their training.

Continue Your CCR Technical Diving Journey

Ready to explore deeper dive sites with rebreather technology?

Join our TDI Mixed Gas CCR Diver – rEvo Course and take your technical diving skills to the next level.

Reserve your spot today.