CCR Air Diluent Decompression Procedures Diver - HOLLIS PRISM II or Liberty

  • Brand: TDI
  • Product Code: Rebreather Deco
  • Availability: In Stock

CCR Air Diluent Decompression Procedures Diver - Prism II - Liberty

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, ’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  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.

Course prerequisites:

Minimum age 18 

Provide proof of 50 logged dives 

Provide proof of  Advanced Nitrox Diver and Deco Procedures Diver or equivalent from agencies recognized by  

If the rebreather is a  approved sidemount rebreather, the student must hold the  Sidemount Diver certification or equivalent and provide proof of 10 logged sidemount dives 


Minimum age 18 

Air Diluent CCR Diver certified or equivalent 

30 hours on the CCR unit 

Six months CCR diving experience

What you can expect to learn:

The  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  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  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


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