RAID Limited Trimix Deco Diver (45m)

Begin Your Trimix Journey With Precision, Safety, and Confidence

Instant access to your online learning, course preparation modules. Begin training immediately.

Why Choose The RAID Limited Trimix Decompression Diver Course?

The RAID Limited Trimix Decompression Diver (45m) course is your first progression into helium-based diving, combining the familiarity of air/nitrox with the benefits of a small helium component to reduce narcosis, improve clarity, and enhance diver performance at depth.

This course is ideal for divers who want a safe, structured introduction to trimix without the complexity of full mixed-gas training. Building on your existing decompression skills, you’ll gain the confidence and competence to complete planned decompression dives to 45 metres / 148 feet, using a light trimix blend and up to two decompression gases, including 100% oxygen.

Stuart’s training approach ensures you gain mastery of gas planning, decompression discipline, and ascent control — key foundations for deeper trimix levels.

What This Course Helps You Achieve

  • Reduced narcosis & improved cognition at depth

  • More stable buoyancy and ascent control under stress

  • Efficient gas planning using helium components

  • Safe execution of planned multi-stage decompression

  • The technical discipline required for deeper trimix pathways

What You’ll Learn in the Limited Trimix Decompression Diver Course

Training blends theory, practical skills, and real-world decompression procedures to build your capability as a developing technical diver.

What This Course Helps You Achieve

  • Plan and execute decompression dives to 45m using Air/Nitrox/Light Trimix

  • Manage PO₂ exposure, END calculations, and safe helium blending limits

  • Conduct precise ascent profiles with controlled stops

  • Execute safe and efficient stage cylinder handling

  • Deploy SMBs and reels under task loading

  • Respond to extended-range emergencies and gas failures

  • Maintain stable buoyancy and trim during long decompression holds

  • Apply team protocols for advanced technical dive communication

This course builds your competence, confidence, and situational awareness as a new OC Trimix diver.

RAID Limited Trimix Decompression Diver 45M: Course at a Glance

  • Max Depth: 45 metres (148 feet)

  • Breathing Gases: Air, Nitrox, light Trimix

  • Decompression Gases: Up to 2 (up to 100% O₂)

  • Mandatory Decompression: Yes

  • Configuration: Twinset or Sidemount

  • Primary Focus: Reduced narcosis & improved performance (limited helium)

  • Program Length: Online academics + confined water + minimum open-water requirements

  • Prerequisite Pathway: Follows 40m/45m Air/Nitrox Decompression Diver

Limited Trimix Deco 45 Course Prerequisites

To enrol in the RAID Rebreather Diver course, you must meet the following requirements:

  • Be 18 years or older

  • Hold RAID Decompression Diver (40m/45m Air/Nitrox) certification

  • Hold RAID Nitrox certification

  • Have logged at least 50 dives, including:

    • 10 dives deeper than 27m

    • 10 decompression or staged training dives

  • Be medically fit for technical diving

  • Complete all RAID documentation and online registration

Mastering the Core OC Trimix Diver Skills

Your training follows RAID’s structured technical progression, beginning with foundation theory, refining your skills in confined water, and culminating in advanced open-water execution.

Step 1: Online Learning

Complete all RAID academic modules covering:

  • Decompression theory

  • Gas planning with limited helium

  • END, gas density, and safe limits

  • Oxygen exposure management

  • Buoyancy, trim, stability & ascent discipline

  • Emergency decompression protocols

  • Stage cylinder and gas-switch safety

Step 2: In-Water Skills

You will complete a skills-focused confined session to master:

  • Stage cylinder setup and handling

  • Controlled gas switches

  • Neutral buoyancy during task loading

  • Valve drills (twinset/sidemount)

  • SMB deployment from depth

  • Simulated failures and emergency ascent drills

Step 3: Open Water Dives

Your open-water training includes multiple staged decompression dives with:

  • Limited trimix breathing gas

  • Multi-stop decompression schedules

  • Team protocols and emergency procedures

  • Stress-resistant ascent control

  • Real-world decompression discipline under supervision

Instant access to your online learning, course preparation modules. Begin training immediately.

Certification Limits & Operational Protocols

  • Conduct planned decompression dives to 45m

  • Use light trimix as the primary gas

  • Use up to two decompression gases, including 100% oxygen

  • Execute multi-level decompression schedules

  • Plan and manage extended gas strategies for 45m diving

Progression Pathway

The 45m Limited Trimix certification is the gateway to deeper, more capable technical diver qualifications:
➜ Advanced Decompression Diver (50m Trimix)

➜ Normoxic Trimix Diver (60m)

➜ Hypoxic Trimix Diver (80–100m)

➜ Full expedition-level mixed gas pathways

Train With a RAID CCR Trainer & Examiner

Your instructor trains you directly on the same configuration dive gear as you'll be diving. All confined and open-water sessions are closely supervised for safety, mastery, and confidence-building. Stuart’s instruction blends disciplined skill development with the confidence-building mentorship required for advanced technical exploration.

Why Train With Stuart Girdler?

  • Proven technical training experience across OC & CCR

  • Deep military and expedition diving knowledge

  • Mastery in both twinset and sidemount platforms

  • Precision-focused training and small instructor ratios

  • Real-world decompression, bailout, and mixed-gas expertise

  • Over 30 years of professional diving experience

How To Begin Your Training

You can begin immediately with RAID Free Learning, gaining instant access to online learning modules, course preparation materials, trimix fundamentals, extended-range decompression theory. Ready to begin your trimix journey?

Instant access to your online learning, course preparation modules. Begin training immediately.

OPEN CIRCUIT TEC

RAID OC Tec courses focus on advanced open-circuit diving skills, including gas planning, decompression, and deep diving techniques for extended range exploration.

CLOSED CIRCUIT TEC

RAID CCR Tec training introduces divers to closed-circuit rebreathers, offering precision, efficiency, and longer dive times through cutting-edge technology

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