TDI Extended Range
Take your skills to the edge

TDI Extended Range

25,000 ฿

Book now
  • Days


  • # of Dives


  • Max Depth


  • Prerequisites

    18 years old

    Certified in decompression procedures

    100 logged dives

There are places in the world that have spectacular dive sites at depths deeper than 40 meters/130 feet, and not many places that have access to Helium. So then how do you access these sites? By taking TDI Extended Range course, that’s how!

The TDI Extended Range course teaches you the proper techniques to utilizing compressed air as breathing gas at a maximum depth of 55 meters/180 feet, so you’ll never miss those really deep dives again. The course will provide the training necessary to competently execute dives to this depth that require staged decompression, using nitrox mixtures or oxygen during decompression.

A big part of the TDI Extended Range course is focused on narcosis management. The difference between the effects of gas narcosis at 45 meters and at 55 meters can be considerable, so exposure to depth during the course is fundamental.

Risk management is also rigorously taught in tandem with task loading on training dives. Our instructors will slowly add more and more to your plate underwater so that you get used to having multiple things that require your attention. In the event of an emergency on an extended range dive, this repetitive task loading training is invaluable and will allow you to deal with any issue comfortably.

The TDI Extended Range course is a good alternative for divers that don’t want to deal with the prohibitive costs of diving on Helium mixes. The course is also a good starting point to move into TDI Trimix training.

You must be 18 years or older to register for the TDI Extended Range course. You must also have completed the Decompression Procedures course and have proof of at least 100 logged dives, 25 of which need to be deeper than 30 meters/100 feet.

Our TDI Extended Range instructor out on the boat conducting a course

The TDI Extended Range course takes a look at the following:

  • History of deep air diving
  • Physics – Pressure review, formulas for solving dive planning problems, maximum operating depths (MOD), best mix, and more.
  • Physiology – Hypoxia, oxygen toxicity, nitrogen narcosis, nitrogen absorption and elimination, carbon dioxide toxicity, carbon monoxide, hyperthermia, hypothermia.
  • Decompression options – Air, Nitrox, oxygen.
  • Equipment considerations
  • Dive tables
  • Dive planning – Operation planning, team planning, emergency planning.
  • Diving procedures
  • Descent procedures
  • Descent considerations
  • Technical dive support
  • Navigation

Don’t forget! Because of the extra nitrogen your body builds up while scuba diving, you cannot fly within 24hrs of your last dive.

Are you fit to dive?

Scuba diving is an activity that requires a certain level of physical health. Read this medical questionnaire. If you can answer yes to any of the questions you may require medical clearance to enrol in a diving course. Contact us for more information.

OK, sounds great, how do I book?

Just hit the button, or if you have questions, we're here to help- quickest way to contact us is using the Facebook button at the bottom :)

Book now