TDI Advanced Nitrox Diver

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All courses bookable with a simple deposit.

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The TDI Advanced Nitrox Diver program qualifies divers to dive to 40m for dives that require decompression stops based on your back gas, using nitrox mixtures up to and including 100% oxygen for increased safety during your decompression stops.


  • Nitrox Diver (or qualifying certification from another organisation)
  • Have a minimum of 25 logged dives
  • Be 15 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 Diver theory with your instructor, including content on oxygen exposure tracking for technical and gas switch dives, equipment setup and configuration, physiology and decompression as well as a gas switch decompression dive planning workshop. You will then move to our 5.5m indoor heated pool (or a suitable confined water site abroad) where you will learn the skills required to safely conduct decompression, and 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 diver program culminates in 4 open water dives, during which you will demonstrate your ability to safely conduct at least two decompression dives to a maximum depth of 40 meters, including a switch to a rich nitrox mix (safety gas) during your decompression. On each of these dives, you will carry out the drills which technical diving makes possible, including shutdowns that 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 diver exam.


For holders of TDI Advanced Nitrox diver certifications, your options are many and varied.

For those wanting to dive a little deeper and use a nitrox mix to accelerate your decompression the TDI Decompression Procedures course offers diving to 45m.

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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