Getting the ‘thumbs up' sign is probably the worst signal any diver can receive since it signifies that the dive has ended. Extending time, and sometimes depth, in water is probably every divers desire. The thrill of pushing the envelope and becoming an explorer is what drives many to become divers, and the Deco 50 course forms the basis and essential skills and knowledge needed to become an explorer.

Deco 50 has been written with the new technical diver in mind. This means that divers wanting to participate in technical open circuit programs and who are certified in Deep 40, Master Rescue and Nitrox may bypass the Deco 40 program.

The course has modern, graphic rich manuals which explore and introduce the most modern information and techniques. A modern skill set places emphasis on managing skill mastery while neutrally buoyant. The skills themselves have been up as well with desire being that RAID divers will use a similar equipment configuration and perform the skills in a similar fashion.

The manuals also cater to the sidemount diver wanting to become Deco 50 diver.

Course Overview & What's Involved

- You'll dive to a maximum depth of 50m
- You'll use nay combination of air, nitrox, trimix and/or oxygen
- Your END/EAD for trimix must not exceed 30 metres
- You will complete a maximum of 30 minutes accelerated decompression
- Divers may only utilise a single decompression gas
- Divers may use up to 100% oxygen for accelerated decompression
- Divers must use a multi-gas switch computer

- You'll need to complete the eLearning theory before your first practical session
- There is 1 confined session to complete
- There are 8 open water dives to complete

*If you've completed RAID DECO 40, this credits towards your RAID DECO 50 course.


- Must be certified as a RAID Nitrox Diver, Deep 40 Diver and Master Rescue Diver (or equivalent)
- Must have experience in Navigation and Night/Limited visibility diving
- Must have logged at least 5 hours between 27-40m
- Must have logged 75 dives using open circuit
- Must have been an certified & active diver for at least the last 3 months
- Minimum of 18 years old
- Must submit proof of current rescue breathing, CPR training and Oxygen Provider certificates
- You must have all of your own kit for this course, please speak with us for more information.

How to get started!

- Register/sign into your RAID account online at
- Assign Dorset Diving Services as your local Dive Centre (Click your RAID Profile, Select 'View or change My Dive Centre')
- Have a browse through the courses and select the course(s) you'd like to do
- Download your FREE eLearning materials and start reading
- Let us know what course(s) you have selected and we can sit down & compare diaries to get you booked into your practical training!
- Payment for your practical training is required at the time of booking and all eLearning/Quizzes/Exams must be completed the day before your first practical session.

When completing this course you maybe asked to attend either Vobster Quay/National Diving Centre, a local shore site or a boat dive. Seperate entry and parking fees may apply - these are not included in the cost of your course.
Boat dives are on Monday & Thursday evenings from 1730 onwards and depart from Poole Quay. Student spaces are £60.
Vobster Quay (Frome) will be on a weekend (or 2) at a cost of £23 per diver, per day.
National Diving Centre (Chepstow) will be on a weekend (or 2) at a cost of £22 per diver, per day. 
You will need to make your own way to the sites. Accommodation and gas prices are not included.

Our Course Terms & Conditions can be read here, by purchasing this product you agree to all Terms & Conditions.



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