Extended Range Trimix Diver

SSI Extended Range Trimix Diver Course at XR Explorers is your gateway to deep, technical diving. You’ll learn to plan and conduct decompression dives using normoxic trimix gas blends to a maximum depth of 45 meters (145 feet), with up to 25 minutes of planned decompression.


This course emphasizes precision, team protocols, and disciplined dive planning, all following the DIR (Doing It Right) philosophy. It’s the ideal next step for divers ready to explore deeper, with a focus on safety, efficiency, and control.

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Course Overview
What's Included?

Build Mastery for Deep Exploration: XR Explorers Extended Range Trimix Diver Course

The SSI Extended Range Trimix Diver Course at XR Explorers is where advanced divers become true technical divers. This program is designed for those who are serious about expanding their depth limits, taking on longer decompression obligations, and learning the complex procedures that allow for safe exploration of deeper, high-risk environments.

Using normoxic trimix gas blends to minimize narcosis and gas density issues, you’ll plan and execute dives to a maximum depth of 45 meters (145 feet) with up to 25 minutes of accumulated decompression. But this course is about far more than depth and bottom time—it's about discipline, precision, and control.

You’ll refine critical skills including gas switching, team ascent protocols, and decompression planning. You’ll also master emergency procedures like valve failures, lost deco gas, and out-of-gas scenarios, through realistic, high-stakes training.

This course is taught using a DIR backmount twinset with stage cylinder, ensuring you're equipped with the most streamlined and efficient configuration for real-world technical diving.

If you're ready to lead, be trusted at depth, and dive where few others go—this is your next step.


Course Details
  • Duration: 5 to 6 days
  • Maximum Depth: 45 meters (145 feet)
  • Decompression: Up to 25 minutes using normoxic Trimix & 100% oxygen
  • Gas Mixes: Trimix (min. 18% O₂) & 100% O₂ for accelerated deco
  • Equipment: DIR backmount twinset with stage cylinder
  • Academic Sessions: Advanced deco theory, gas planning, emergency procedures
  • Confined Water Dives: 4 dives focused on trim, propulsion & skills
  • Open Water Dives: 6 dives focused on staged deco, gas switches, team diving
Prerequisites
  • Minimum Age: 18 years
  • Certifications: SSI Deep Diver & Enriched Air Nitrox (or equivalent)
  • Logged Dives: Minimum 50 dives including staged deco dives
  • Recommended: XR Foundations Course for trim, buoyancy & team protocols

Your class includes:

  • Digital SSI Extended Range Nitrox/Trimix Diver course materials.
  • Intensive hands-on training in decompression diving, gas planning, staged cylinder handling, emergency procedures, and team diving skills.
  • Comprehensive training in gas switching procedures, team ascent protocols, decompression planning, and emergency management.
  • Realistic scenario training for valve failures, lost deco gas, out-of-gas emergencies, and other contingencies
  • Comprehensive equipment configuration and DIR workshops for back-mount twinset or sidemount setups.
  • Six open water dives, focusing on managing decompression profiles and executing precise gas switches.
  • Internationally recognized SSI Extended Range Nitrox/Trimix Diver certification.
  • Clear progression pathways into XR Technical Trimix, Advanced Wreck, Technical DPV, CCR, and Cave Diving specialties.
  • Excludes Trimix for both students and instructor - It will be paid separetly depends on the helium price. (Usually around 0.10 euros / liter)

GET DEEPER
AND STAY
LONGER


LEARN

DIVE PLANNING
TEAM PROTOCOLS
GAS MANAGEMENT
EMERGENCY PROTOCOLS
DECOMPRESSION PROCEDURES

Dive Like a Pro. Lead Like an Explorer.

Master Explorer Bundle –
Master the Art of Exploration

The Master Explorer Bundle is designed for serious recreational divers who want to be fully prepared for any situation underwater. We selected these courses to give divers essential emergency skills with React Right and Stress & Rescue, ensuring you can manage and respond to dive incidents. The Technical DPV course introduces underwater propulsion, allowing you to cover more ground efficiently, while XR Foundations ensures you maintain control, buoyancy, and team awareness at a high level.

Courses Included:

  • XR Foundations (Double or Sidemount Configuration)
  • Technical DPV Diver
  • React Right (First Aid, Oxygen, AED)
  • Stress & Rescue Diver

Save 20%, plus up to 10% more when you sign up with a buddy!

At XR Explorers, we don’t just train divers—we forge explorers.

EXPLORER MASTER CLASS

Lead Divers. Inspire Confidence. Become a Pro.

THE PROGRAM OTHER DIVE SCHOOLS WON’T OFFER. BECAUSE FEW CAN TEACH IT. FEWER CAN COMPLETE IT.

Lead Divers. Inspire Confidence. Become a Pro.

The Explorer Masterclass Bundle is our most comprehensive leadership training program. There are dive courses… and then there’s the Explorer Masterclass.
Exclusively at XR Explorers, this isn’t just another certification—it’s the ultimate diving masterclass, built for those who want to lead, inspire, and become the best divers they can be.

This program will push you, challenge you, and completely transform the way you dive. You will leave as a leader, ready to guide teams, take control, and handle every situation with skill and confidence.

Are you ready to push your limits, master new skills, and become part of the elite few?
Start your journey with XR Explorers and take your diving to the highest level!

Apply Now, Start Your Journey to Dive Mastery

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Frequently Asked Questions

What’s the difference between Extended Range Nitrox and Extended Range Trimix?

Should I take Extended Range Nitrox first, or go straight into Trimix?

Why is helium (Trimix) better than air for deeper dives?

What skills will I learn in these courses?

Is the cost of helium (Trimix gas) included in the course price?

Is this training physically and mentally demanding?

Why does the Extended Range Nitrox/Trimix Course cost more at XR Explorers—and why is it worth it?

How can I get training at a cheaper price or with a discount?