TDI Rebreather Air Diluent (DECO - 45mt)

TDI Rebreather Air Diluent (DECO - 45mt)

No doubt if you are considering this course, you have already done some research on rebreathers, and maybe even had a go!

The reasons for taking this step are many and varied, but whatever it is that has motivated you to do so, this is the rebreather course that will take you safely into the world of silent diving!

At present, courses are only available on any of the Ambient Pressure Diving series of rebreathers (Classic, Evolution, Evolution Plus, and Vision).

Units are available to hire for the duration of the course, or we are an authorised dealer for AP Diving and can advise you on and the arrange the purchase of a new unit.

We do also have some second hand units available at times. Please have a chat with your instructor about all these options.

Why TDI Rebreather Air Diluent (DECO - 45mt)?

This is a certification course for divers wishing to utilize an Ambient Pressure Diving closed circuit rebreather (CCR) for air diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills to a maximum depth of 45 metres / 100 feet, using air as a diluent for formal decompression diving.

Upcoming Courses (back to top)

No courses organised at the moment, please contact us to discuss your requirements.

How do I book myself on a course?

To book yourself on a course please select one of the courses above, send us a message, and we will get back to you to discuss further details.

Further information on TDI Rebreather Air Diluent (DECO - 45mt) (back to top)

What do I need to start?

TDI Diving Rebreathers Student Manual AP Valves unit specific instruction manual (available to download from TDI Decompression Procedures Student Manual (can be loaned for course duration) TDI Advanced Nitrox Student Manual (can be loaned for course duration) TDI CCR Preflight Checklist

What will I do?

The course consists of a minimum of eight hours of theory/knowledge development, accompanied by a minimum of seven open water dives totalling 420 minutes dive time. There will be a gradual increase in depth of dives over the five days to a maximum of 45 metres.

2 dives will be deeper than 20 metres, and one will be deeper than 30 metres.

Theory covered includes:

History of Rebreathers
Comparison of OC, SCR and CCR
Practical mechanics of CCR
Gas physiology
Scrubber packing
O2 addition systems
Dive tables/computers/planning
Emergency proceedures

(Pre) Dive skills covered include:

Unit assembly
Pre dive planning
Emergency procedures
Loop volume control
PO2 monitoring
buoyancy control
Use of SMB
safety stops
Use/carrying stage cylinders to provide adequate bailout for planned dive.
Stage cylinder handling
bailout scenarios
oxygen rebreather mode
Post dive care/maintenance

How long will it take?

The course requires five days to cover all required material.

The courses are usually scheduled to run over five consecutive days (Wednesday-Sunday).

Other scheduling options are available (i.e. over two weekends) but we strongly recommend the course is completed over the shortest period possible. The course must be completed within a six week period.

Please understand that the course is performance based. This means that certification is only awarded upon demonstration of being capable to conduct rebreather dives. This may involve further training dives beyond the seven required.

If a student already qualified as TDI CCR Air Diluent Deco Diver or equivalent from an agency recognized by TDI and wishes to qualify on another CCR recognized by TDI, the student must follow all unit specific course standards except that only 180 minuted dive time required (over three dives and to maximum of 45 metres)

If a student has the TDI Air Diluent CCR Diver (No DECO - 30mt) and wishes to do the decompression part of this course, only then only 240 minutes in open water is required
The student must also have:

minimum of 30 logged hours over 30 dives
Six months CCR diving experience

While not required reading, the following books/articles are recommended reading prior to the course:

Richard Pyle - A Learners Guide to Closed Circuit Rebreather Operations
Kenneth Donald - Oxygen & the Diver
John Lamb - Oxygen Measurement for Divers
Barsky, Thurlow & Ward - The Simple Guide to Rebreather Diving
Bob Cole - Rebreather Diving
Jeffrey Bozanic - Mastering Rebreathers

What previous experience do I need?

To enrol on this course students must:

1. Be minimum age 18
2. Provide proof of 50 logged dives
3. Provide proof of TDI Advanced Nitrox Diver and Deco Procedures Diver or equivalent


1. Minimum age 18
2. TDI Air Diluent CCR Diver (No DECO - 30 mt) certified or equivalent
3. 30 hours on the CCR unit
4. Six months CCR diving experience

What do the fees include?

All professional tuition Insurance costs while on the course TDI Certificate upon completion. TDI registration upon completion. TDI Course manual Use of oxygen analyser

What don't fees include?

Entry fee to dive site used for the Open Water dives (if applicable) Costs of transportation to and from dive sites (if applicable) Any personal costs (eg. food, drink, accommodation) Hire of any equipment for open water Absorbent costs Gas fills Hire of rebreather (if required)

What can I do once I'm qualified?

Upon successful completion of this course, graduates may engage in decompression diving activities utilizing a CCR without direct supervision provided:

Diluent is Air, maximum depth is 45 metres

The diving activities approximate those of training

The areas of activities approximate those of training

Environmental conditions approximate those of training

What's next?

Upon successful completion of this course, graduates are qualified to enroll in:

TDI Mixed Gas CCR course