Technical Diving Without Compromise
Welcome to the quiet side of diving… where bubbles disappear, gas lasts longer, and your connection with the underwater world becomes truly immersive.
The ESS-TEK TDI CCR Air Diluent Diver Course is your gateway into closed circuit rebreather diving — delivered with precision, professionalism, and uncompromising training standards.
At ESS-TEK, we don’t rush divers through certifications. We build calm, capable, technically confident rebreather divers who truly understand their equipment, their physiology, and their responsibilities underwater.
You’ll train on the world-class Inspiration Rebreather, engineered by AP Diving — one of the most respected CCR systems in technical diving.
🌊 Why Dive Closed Circuit Rebreather?
Imagine:
✔ Near-silent diving with minimal bubbles
✔ Dramatically extended gas efficiency
✔ Constant optimal breathing mix at depth
✔ Closer marine life encounters
✔ Precision buoyancy and breathing control
✔ A completely different way to experience the underwater world
A CCR maintains a constant partial pressure of oxygen — effectively acting like a nitrox blending system on your back, adjusting your breathing gas in real time.
This is not just new equipment.
This is a new way of diving.
🎯 What This Course Qualifies You To Do
During this programme, you will learn to safely conduct:
✔ No-decompression CCR dives
✔ Using air diluent
✔ To a maximum depth of 30 metres / 100 feet
✔ Using your trained unit configuration
Upon certification, you may dive independently within training limits and environmental conditions similar to those experienced during the course.
🧭 The ESS-TEK Training Philosophy
Anyone can issue a certification card.
ESS-TEK builds divers who:
✔ Understand why, not just how
✔ React calmly under pressure
✔ Master checklists and discipline
✔ Think like technical divers
✔ Can manage failures — not fear them
Our instructors teach deliberately, thoroughly, and professionally.
If you train with us, you will earn your qualification — and the confidence that comes with it.
👤 Who This Course Is For
This course is ideal for certified divers who want to:
📸 Improve underwater photography opportunities
🪸 Get closer to marine life
🔇 Experience silent diving
âš™ Expand into advanced equipment configuration
🧠Begin the technical diving pathway
If you want deeper understanding — not just new gear — you belong here.
📋 Entry Requirements
To enrol, you must:
✔ Be at least 18 years old
✔ Have 20 logged open water dives
✔ Hold Nitrox certification (or equivalent recognised level)
🧠 What You Will Learn
This is an in-depth technical programme covering both theory and real-world application.
CCR Theory & Systems
✔ History and evolution of rebreathers
✔ Open vs closed vs semi-closed systems
✔ Gas physiology and oxygen management
✔ Electronics and control systems
✔ Dive tables and CCR dive computers
Equipment Mastery
✔ Unit assembly and breakdown
✔ Proper scrubber packing (manufacturer standard)
✔ Sensor monitoring and set-point management
✔ Diluent and oxygen analysis
✔ Maintenance and post-dive care
Dive Planning & Operations
✔ Pre-dive planning and structured checklists
✔ Emergency procedures and failure management
✔ Loop volume and buoyancy control
✔ Leak and bubble checks
✔ Surface marker deployment
✔ CNS exposure management
🌊 In-Water Training Requirements
You will complete multiple open water CCR dives between:
9 metres and 30 metres (30–100 ft)
Including:
✔ Progressive depth exposure
✔ Dives deeper than 20m and 27m
✔ Safety stops and controlled ascents
✔ Continuous PPO₂ monitoring
✔ Real-time loop management
All training follows strict operational limits including oxygen exposure and manufacturer recommendations.
🛟 Critical Skill Development
You will demonstrate competence in:
✔ Full unit setup and verification
✔ Gas analysis and verification
✔ Structured pre-dive checks
✔ Emergency drills and response
✔ Buoyancy via loop volume control
✔ Safe dive execution within planned limits
✔ Post-dive servicing and maintenance
This is hands-on, skills-focused training — not just theory.
🎓 Certification Requirements
To graduate, you must:
✔ Score at least 80% on the written examination
✔ Complete all open water skills competently
✔ Demonstrate sound dive planning judgement
✔ Finish the course within 6 weeks
✔ Maintain proficiency (refresher required after 6 months inactivity)
🧪 Equipment Platform
Training is delivered on the professional-grade Inspiration Rebreather from AP Diving — known worldwide for reliability, engineering excellence, and technical diving pedigree.
🚀 What Happens After Certification?
You will be qualified to dive your trained CCR:
✔ To 30m maximum depth
✔ No decompression diving
✔ In conditions similar to training
✔ Without direct instructor supervision
This is also your foundation for advanced CCR and technical training pathways.
⭐ Why Train With ESS-TEK?
Because quality matters more than speed.
We deliver:
✔ Small group, focused instruction
✔ Real technical diving discipline
✔ Structured skill progression
✔ Instructor mentorship
✔ Training that builds genuine competence
Our goal is simple:
Produce exceptional divers — not just certified ones.
📅 Start Your Rebreather Journey
If you’re ready to experience silent diving, precision control, and true technical discipline…
Your CCR journey begins here.
👉 Contact ESS-TEK to discuss course dates, equipment, and training structure.
👉 Speak to our instructors about your readiness and progression pathway.
👉 Take your first step into technical rebreather diving.