RB Deco 50m/165ft


This is an rebreather Extended Range entry into Trimix programme designed to extend your knowledge and introduce the skills and decompression procedures required in the use of mixed (Oxygen, Helium & Nitrogen) gases for Sport Diving to a maximum depth of 50m / 164ft.

It develops the sport diving skills and provides a greater understanding of the concept of limited decompression sport diving with the use of Helium gas to reduce narcosis (18/27).


This programme qualifies you to a depth of 50 m/164 ft and complete dives with mandatory decompression stop requirements for up to maximum of 30 minutes.

This speciality is generic and may be applied to any rebreather which meets the requirements and any diver who meets the prerequisites.


Stage cylinder Open Circuit oxygen enriched gas (EANx / Nitrox) mixes from 21% to
a maximum of 50% oxygen content.
Diluent gas must not have an oxygen content below 18%
Maximum set point 1.3
A maximum of 27% Helium content


To be a minimum of 16 years old.
To be a certified diver for at least 3 months.
Certified RAID Rebreather 40m/132ft Level 3 diver or equivalent rebreather certification/s (of which at least 5 hours are between 27- 40 m/89-132 ft).
Rebreather Speciality or equivalent
Submit a current Rescue Breathing/CPR Training and Oxygen Provider certificate (DAN/equivalent).
50 logged hours underwater using a rebreather.
Documented proof of prerequisite requirements needs to be presented to the Dive Centre for
approval prior to any in water training.
Complete the medical statement and if you answer YES to any question, then pass a dive
medical. We do recommend you have a dive medical with a certified dive doctor, before this course


RAID On-line e-learning academic presentations, quizzes, exam and practical skills as detailed.
Stamina and Waterman ship skills.
Confined water and open water sessions, totalling a minimum of 6 hours (360 min) underwater.


For this course you will be required to have use of the following:

1 x rebreather with the following requirements but not limited to:
RAID Registered Rebreather
Manual Oxygen addition valve - optional
Manual Diluent addition valve - optional
PpO2 Display
ADV with on/off switch
Manufacturer's depth specifications/limitations are below the depth limit of this course

2 x single side sling cylinders
2 x first stage
2 x second stage with Octo hose
2 x SPG with short HP hose
2 x BCD/inflator LP hose
1 x Drysuit inflator hose if applicable interchangeable with BCD connection
1 x mixed gas rebreather dive computer
1 x dive timer or enriched air computer
1 x slate
2 x SMBs and reels
1 x knife
2 x dive masks
1 x torch/light/underwater lamp
1 x BCD/harness and wing with adequate lift capacity
1 x exposure suit as required - A Dry suit shall have interchangeable inflator system with BCD LP hose


All confined and open water skills have been acknowledged and accepted on-line through the
RAID web site by both yourself and your instructor.
The RAID Dive Centre has confirmed certification on-line through the RAID web site.
The above is subject to the RAID General Diving Standards and change without notice.


This course may be purchased through the on-line store when you are logged in.