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 β delivered with precision, professionalism, and uncompromising training standards.
At ESS-TEK, we donβt rush divers through certifications. We build calm, capable, technically confident rebreather divers who truly understand their equipment, their physiology, and their responsibilities underwater.
Youβll train on the world-class Inspiration Rebreather, engineered by AP Diving β one of the most respected CCR systems in technical diving.
🌊 Why Dive Closed Circuit Rebreather?
Imagine:
β Near-silent diving with minimal bubbles
β Dramatically extended gas efficiency
β Constant optimal breathing mix at depth
β Closer marine life encounters
β Precision buoyancy and breathing control
β A completely different way to experience the underwater world
A CCR maintains a constant partial pressure of oxygen β 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:
β No-decompression CCR dives
β Using air diluent
β To a maximum depth of 30 metres / 100 feet
β 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:
β Understand why, not just how
β React calmly under pressure
β Master checklists and discipline
β Think like technical divers
β Can manage failures β not fear them
Our instructors teach deliberately, thoroughly, and professionally.
If you train with us, you will earn your qualification β and the confidence that comes with it.
👤 Who This Course Is For
This course is ideal for certified divers who want to:
πΈ Improve underwater photography opportunities
πͺΈ Get closer to marine life
π Experience silent diving
β Expand into advanced equipment configuration
π§ Begin the technical diving pathway
If you want deeper understanding β not just new gear β you belong here.
📋 Entry Requirements
To enrol, you must:
β Be at least 18 years old
β Have 20 logged open water dives
β 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
β History and evolution of rebreathers
β Open vs closed vs semi-closed systems
β Gas physiology and oxygen management
β Electronics and control systems
β Dive tables and CCR dive computers
Equipment Mastery
β Unit assembly and breakdown
β Proper scrubber packing (manufacturer standard)
β Sensor monitoring and set-point management
β Diluent and oxygen analysis
β Maintenance and post-dive care
Dive Planning & Operations
β Pre-dive planning and structured checklists
β Emergency procedures and failure management
β Loop volume and buoyancy control
β Leak and bubble checks
β Surface marker deployment
β CNS exposure management
🌊 In-Water Training Requirements
You will complete multiple open water CCR dives between:
9 metres and 30 metres (30β100 ft)
Including:
β Progressive depth exposure
β Dives deeper than 20m and 27m
β Safety stops and controlled ascents
β Continuous PPOβ monitoring
β Real-time loop management
All training follows strict operational limits including oxygen exposure and manufacturer recommendations.
🛟 Critical Skill Development
You will demonstrate competence in:
β Full unit setup and verification
β Gas analysis and verification
β Structured pre-dive checks
β Emergency drills and response
β Buoyancy via loop volume control
β Safe dive execution within planned limits
β Post-dive servicing and maintenance
This is hands-on, skills-focused training β not just theory.
🎓 Certification Requirements
To graduate, you must:
β Score at least 80% on the written examination
β Complete all open water skills competently
β Demonstrate sound dive planning judgement
β Finish the course within 6 weeks
β Maintain proficiency (refresher required after 6 months inactivity)
🧪 Equipment Platform
Training is delivered on the professional-grade Inspiration Rebreather from AP Diving β known worldwide for reliability, engineering excellence, and technical diving pedigree.
🚀 What Happens After Certification?
You will be qualified to dive your trained CCR:
β To 30m maximum depth
β No decompression diving
β In conditions similar to training
β 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:
β Small group, focused instruction
β Real technical diving discipline
β Structured skill progression
β Instructor mentorship
β Training that builds genuine competence
Our goal is simple:
Produce exceptional divers β not just certified ones.
📅 Start Your Rebreather Journey
If youβre ready to experience silent diving, precision control, and true technical disciplineβ¦
Your CCR journey begins here.
π Contact ESS-TEK to discuss course dates, equipment, and training structure.
π Speak to our instructors about your readiness and progression pathway.
π Take your first step into technical rebreather diving.