TDI Advanced Nitrox & Deco Procedures Diver

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TDI Advanced Nitrox and Decompression Procedures Diver: this program qualifies divers to dive to 45m and to perform required decompression stops.


  • Advanced Open Water Diver
  • Nitrox Diver
  • Have a minimum of 50 logged dives
  • Be 18 years of age
  • Appropriate theory for the course. This can be assigned to you on payment of the deposit.

You will complete the TDI Advanced Nitrox and Decompression Procedures theory with your instructor, including content on oxygen exposure tracking for technical and accelerated gas switch dives, equipment set up and configuration, physiology and decompression as well as a gas switch decompression dive planning workshop.

You will then move to a suitable confined water site where you will learn the skills required to safely conduct decompression, gas switch dives using a twinset and stage cylinder. This session also gives you the perfect opportunity to put the equipment changes made in the workshop to the test.

The TDI Advanced Nitrox and Decompression Procedures diver program culminates in 6 open water dives, during which you will demonstrate your ability to safely conduct at least four decompression dives to a maximum depth of 45 meters, including a switch to a rich nitrox mix to accelerate your required decompression.

On each these dives you will carry out the drills which technical diving makes possible, including shut downs which enable you to deal with catastrophic gas loss in a safe manner and end your dive in a controlled manner. In doing so you will be becoming a self sufficient diver able to deal with buddy separation and/or equipment malfunctions. Completion of the course requires passing the TDI Advanced Nitrox Decompression Procedures diver exam.


For holders of the TDI Advanced Nitrox and Decompression Procedures, your next step is the TDI Trimix Diver program.

This qualifies divers to perform dives outside of training to depths up to 60m while using helium-based breathing mixtures (with at least 18% oxygen) to reduce the END to a maximum 40m and to perform required decompression stops using any mixture of EANx up to 100% oxygen.

Human Factors in Diving: The essentials

This 3-hour online class is a great starting point to find out why we make mistakes and how we can reduce the likelihood of an accident or adverse event occurring. We dive into decision making, situational awareness, communication and cooperation skills, and crucially, their interdependence. Using case studies and practical exercise, we bring the topic to life. Want to gain a quick but valuable insight? 

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To enrol onto this course, you will need to pay your deposit in advance so we can register and send you the course materials. You will need the materials to ensure you are prepared to start your training when you arrive at Techwise for your course. If this is what you want to do click DEPOSIT and then the BUY IT NOW button. 

Frequently asked questions

If you are interested in technical diving and want to explore the many exciting and challenging adventures that it has to offer, there are a variety of organisations and programs you can choose from. Before getting certified, it is important to research the various types of technical diving available and choose a program that you feel comfortable with and that offers the specialties and equipment you need to safely and successfully explore the full range of dive possibilities.

The best way to compare these different technical diving agencies and choose the right one for you is to thoroughly research each organization's offerings and requirements, and to speak with other divers who have completed these training programs. Once you have an understanding of what each agency has to offer, you can make an informed decision about which program is right for you and start planning your next technical diving adventure!

When you’re getting into technical diving, there are a number of different pieces of gear that you’ll need to make sure that you have everything set up properly. Here is an outline of what is required by most technical diving agencies;.

Core Twinset Equipment

The fundamental equipment required for new technical divers is their wing, backplate and twinset regulators.

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