TDI Advanced Nitrox & Deco Procedures

Ever found yourself wondering what the deal is with those people jumping in the water with loads of cylinders hanging off them? Do you want to spend more than twenty minutes on the wreck that you got up so early in the morning to get to? What to learn new skills and take on new challenges? Want to take on new dives that had previously been beyond your training? If the answer to any of these questions is, then this is certainly a course you should be considering. Many people view this course to be heading down the technical diving route. While this is largely true, it is not always the case. It may just be that you are looking to expand your knowledge and skills or wish to maximise your time on the dive. Others may have found themselves doing a bit of deco (!) on their computers before, and have realised they should have a better understanding of the theory behind doing this. The reason are many and varied...!!!

Why TDI Advanced Nitrox & Deco Procedures?

This course examines the theory, methods and procedures of planned stage decompression diving. The objective of this course is to train divers how to plan and conduct a standard staged decompression dive not exceeding a maximum depth of 45m. The most common equipment requirements, gear set-up, and decompression techniques are presented. Students will be able to utilize Enriched Air Nitrox mixes or oxygen for decompression. PLEASE NOTE: Advanced Nitrox and Decompression Procedures can be conducted as stand alone course in their own right. If this is what you are interested in, please get in touch with us for further details.

Upcoming Courses (back to top)

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

Need more flexibility?

This course will run for 4days for AN&DP on Open Circuit or 5days if CCR Inspo Dil.


This course is the foundation course in technical diving. All technical dive training taken after this course is completed builds on the skills and attitudes learned while undertaking this course. The course examines the theory, methods, and procedures of planned staged decompression diving. The course objective is to train divers how to plan and conduct a standard staged decompression dive not exceeding a maximum depth of 45m using staged nitrox up to 100% to accelerate the decompression.


This is the ideal course for diving in Scapa Flow and many of the UK’s coastal wrecks.


PLEASE NOTE: Advanced Nitrox and Decompression Procedures can both be facilitated as standalone courses in their own right. Please contact us if this is something you are interested in (£300 per course).


Qualification Depth


45 meters maximum utilising up to 100% oxygen for accelerated decompression


Course is performance based




4 days, (minimum 6 dives)






Includes: Manual, certification, use of 02 analyser, twinset, regulators and stages


Excludes: Site entrance fees, gas fills, equipment hire (canister torches, SMB’s, slates etc.).


Previous Experience/Notes


Minimum Age: 18


Logged dives: Proof of 25 logged dives


Minimum qualifications: Minimum certification of SDI Advanced Adventure Diver, Advanced Diver, or equivalent


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.

Course Comments...

Below are comments from previous customers who have taken this course. If you have taken this course with us within the past six months please feel free to post your comments.

"I had a fantastic three days diving with Ian and Mark on the Advanced Nitrox and Deco procedures course. You'd struggle to find more professional and helpful instructors anywhere.
I had complete confidence when diving with them and can't wait to get back to finish off the course."

From Paul Beddows, course taken April 2014

See more comments about this course....

Further information on TDI Advanced Nitrox & Deco Procedures (back to top)

What do I need to start?

TDI Advanced Nitrox Manual TDI Decompression Procedures Manual/Workbook We strongly recommend that the course is conducted using a twinset. If you have never used one before, this course can be taken in conjunction with a Twinset Familiarisation Course. Twinsets/regulators are available for hire for the duration of the course. In addition, there are a number of ancillary equipment items that are required for the course. Please contact us for full details. All of these can be hired for the duration of your training.

What will I do?

The course consists of a minimum of ten hours of theory/knowledge development, accompanied by a minimum of six open water dives. Two of those dives must be deeper than 30 metres. Subject areas covered include: Physics Review Physiology Review Formulas Review Equipment Considerations Dive table review Dive computers Dive Planning Decompression Theory Decompression gas choice Ascent / Descent Techniques Decompression stations types Surface Support considerations The open water dives will develop students: Teamwork situational awareness buoyancy trim stress analysis/mitigation stage handling ascent/descent techniques awareness gas management

How long will it take?

The course requires three days to cover all required material. The courses are usually scheduled to run over three consecutive days (Friday/Saturday/Sunday). Other scheduling options are available but we strongly recommend the course is completed over the shortest period possible. Please understand that the course is performance based. This means that certification is only awarded upon demonstration of being capable to conduct decompression dives. This may involve further training dives beyond the six required

What previous experience do I need?

To enrol on the course students must: 1. Be minimum age 18 2. Have minimum certification of SDI Advanced Diver, or equivalent 3. Show proof of 25 logged open water dives

What do the fees include?

All professional tuition Course Manual Insurance costs while on the course All registration fees with TDI upon completion. Use of Oxygen analyser. Use of dive planning software (various types)

What don't fees include?

Hire of any equipment 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)

What can I do once I'm qualified?

Upon successful completion of this course, graduates may engage in decompression diving activities without direct supervision provided: 1. Maximum depth is 45 metres 2. The diving activities approximate those of training 3. The areas of activities approximate those of training 4. Environmental conditions approximate those of training

What's next?

Upon successful completion of this course, graduates are qualified to enroll in: 1. TDI Extended Range Course 2. TDI Entry Level Trimix Course