TDI Mod1 Air Diluent Decompression CCR Rebreather Course

Duration: Five days (minimum)
420 minutes minimum in water
Rebreather Course Prerequisites: Minimum age 18
Provide proof of 50 logged dives
Provide proof of TDI Advanced Nitrox Diver and Deco Procedures Diver or equivalent from agencies recognized by TDI
If the rebreather is a TDI approved sidemount rebreather, the student must hold the TDI Sidemount Diver certification or equivalent and provide proof of 10 logged sidemount dives


Minimum age 18
TDI Air Diluent CCR Diver certified or equivalent
30 hours on the CCR unit
Six months CCR diving experience

Cost: € 1000,00
Price includes gases and sofnolime

TDI Mod1 Air Diluent Decompression, rebreather diver training

Are you an open circuit technical diver looking to cross over to the “silent” side? Or maybe you are a CCR Air Diluent Diver looking to progress to the next level? Either way,
TDI’s CCR Air Diluent Decompression Course is the next step.Using the latest technology in CCR’s can maximize your gas supply and provide an optimum breathing gas for any depth by
maintaining a constant partial pressure of oxygen. Like having a blending station on your back, a CCR is the ultimate tool for technical divers.
During this course, your TDI Instructor will teach you all of the necessary skills to conduct decompression CCR dives to a maximum depth of 45 metres/150 feet using air diluent.

Who this course is for:

The open circuit technical diver, or entry level CCR diver, looking to utilize CCR technology to extend their depth limits and bottom times.

What you can expect to learn:

The TDI CCR Air Diluent Decompression Diver course takes an in-depth look at all of the following and more:

History and evolution of rebreathers
Comparison of Open Circuit (OC), closed circuit, and Semi-closed Circuit Rebreather (SCR) systems noting the pros and cons of each
Practical mechanics of the system
Gas physiology
Proper scrubber packing: in accordance with manufacturers recommendation
Electronic or manual systems design and maintenance
Dive tables
Dive computers
Dive planning
Emergency procedures
Dive checklists
Predive checks

Some of the required skills you will have to demonstrate include the following:

All open water dives must be between 9 metres/30 feet to 45 metres/150 feet
Two dives must be deeper than 20 metres/66 feet and one dive must be deeper than 30 metres/100 feet
PO2 not to exceed manufacturer’s recommendation or a working limit of 1.3 bar
All dives to be completed within CNS percent limits with a recommended maximum of 80 percent of the total PO2 CNS limit
Safety stops to be conducted with a minimum 3 minutes at 6 metres/20 feet
When the user opts for an automatic diluent valve (ADV) fitted by the manufacturer, additional skills such as regular diluent gauge monitoring and addition control must be emphasized
Calculate all off board gas at 45.30 litres/1.0 cubic feet per minute usage to cover stress situations
All dives to be completed within appropriate constant PO2 decompression tables
Students must do one bailout from depth on open circuit to include simulated decompression
Pre dive checks utilizing the TDI Pre-flight checklist or manufactures required pre-dive checklist
Unit build-up
Scrubber packing
Demonstrate correct pre dive planning procedures
Mouthpiece familiarity drills
Simulated emergency procedures including: Gas shutdowns and loss of gas
Broken hoses
Flooded absorbent canister
Carbon dioxide (CO2) breakthrough
Semi-closed mode
Low oxygen drills
High oxygen drills
Flooding loop
Electronics and battery failure
Properly execute the ascent procedures for an incapacitated CCR diver
Use of BCD/suit and effective management of loop breathing volume for buoyancy control
Stop at 3-6 metres/10 – 20 feet on descent for leak bubble check
Electronics systems monitoring for PO2 levels (SETPOINT) and switching set points
Manual control of set point if electronically controlled CCR is not used
Use of lift bag/delayed surface marker buoy and reel
Proper execution of the dive within all pre-determined dive limits
Constant loop volume management
Post dive clean of unit to avoid contamination and spread of disease
Dive maintenance of unit
Cell remove and replace
Mouth piece strip and rebuild
Replacing batteries
Demonstrate comfort swimming on surface and at depth carrying 1 bailout/decompression cylinder
Demonstrate ability to drop and retrieve 1 bailout/decompression cylinder while maintaining position in the water column
Demonstrate ability to deploy SMB or lift-bag solo and as a member of a team
Demonstrate appropriate reaction to gas hemorrhage from manifold or first stage, SPG and primary regulator
Demonstrate appropriate reaction to simulated free-flowing deco regulator
Buddy breathing deco gas for at least 1 minute
Oxygen rebreather mode at less than 6 metre/20 foot stop

What’s in it for you?

Upon successful completion of this course, graduates may engage in decompression diving activities utilizing the CCR
they were trained to dive with, without direct supervision of the TDI Instructor so long as the following limits are adhered to:

The diving activities approximate those of training
The areas of activities approximate those of training
Environmental conditions approximate those of training
To a maximum depth of 45 metres/150 feet
Utilizing air diluent

TDI Mod1 Air Diluent Decompression Diver minimum requirements:

Satisfactorily complete the TDI CCR Air Diluent Decompression examination with a passing score of 80%, followed by 100% remediation by the Instructor

Complete all open water requirements efficiently
Demonstrate mature and sound judgment concerning dive planning and execution
Course must be completed within 6 weeks from the starting date
Complete a refresher course following a period of inactivity greater than 6 months following the course