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TDI Courses

TDI Courses are Technical Diving courses covering content for experienced divers engaged in activities outside recreational limits.

Scuba divers get to explore parts of the world that most people will never have the opportunity of seeing other than maybe in a documentary. But even divers are sometimes limited to where they can go and what they can see.  In order to ensure diving is safe and accessible, limits apply to recreational diving, beyond which a variety of safety issues (Oxygen Toxicity, Nitrogen Narcosis to name but a few) make it more difficult to dive safely.  Specialized training and equipment is required beyond these limits - this is where the "Technical Diving" starts off.

TDI and PADI TecRec courses can open up opportunities to experience new dive sites and areas beyond the recreational realm.  Started in the form of cave diving, technical scuba diving takes divers beyond the typical recreational limits and allows them to do more. Typically, one or more of the following has to occur for a dive to be considered technical diving:

  • Diving beyond 40 metres/130 feet deep.
  • Required stage decompression.
  • Diving in an overhead environment beyond 40 linear metres/130 linear feet of the surface.
  • Accelerated decompression and or the use of variable gas mixtures during the dive.

It’s important to remember that technical diving can have more risks, potential hazards and shorter critical error chains than recreational scuba diving.  It requires more training, discipline and equipment than recreational diving.  It’s of paramount importance to ensure the proper training is undertaken before diving beyond recreational limits.

So why even do it? Simply put, to explore where few people can. As a technical diver, you would get to see amazing wrecks that are hidden away and untouched, as well as marine life that don’t live in your typical diving zone. Other people simply like the hard work and want to be challenged. For them, the more effort and planning they put into their dives, the greater the reward.

So how do you get started? Divers who are interested in getting involved in technical diving can get the training and knowledge they need through our courses. Each course level will introduce you to new gear, planning and procedures that are necessary for the diving limit. In these courses, you’ll start as a beginner, but when finished, will be a qualified Tech Diver able to go beyond recreational levels.

Deep divingMaximum depth of 40 metres (130 ft)Beyond 40 metres (130 ft)
Decompression Diving       No decompressionDecompression diving
Mixed gas divingAir and NitroxTrimix, Heliox, Heilair, and Hydrox
Gas switchingSingle gas usedMay switch between gases to accelerate decompression and/or "travel mixes" to permit descent carrying hypoxic gas mixes
Wreck divingPenetration limited to "light zone" or 30 metres depth/penetration    Deeper penetration
Cave divingPenetration limited to "light zone" or 30 metres depth/penetration    Deeper penetration
Ice divingSome agencies regard ice diving as recreational diving.Some agencies regard ice diving as technical diving.
RebreathersSome agencies regard use of semi-closed rebreathers as recreational diving.Some agencies regard use of semi-closed rebreathers as technical diving.


Course Offerings at Dive Wellington

Multiple Tanks for Technical Divers

Intro to Tech Diving

The TDI Intro to Tech Course is an introductory course that expands on recreational training by improving dive planning methods, in-water skills, and streamlining existing gear configurations in a controlled and fun learning environment.

You can expect to learn:

Advanced Nitrox Labelling

TDI Advanced Nitrox

Are you looking to expand your dive time? Maybe you’re a scientific diver or photographer looking to stay in the water a little longer?  The TDI Advanced Nitrox Course qualifies divers to use enriched air nitrox from EAN 21 through EAN 100 percent within your current certification level to a maximum depth of 40 metres/130 feet during dives that do not require staged decompression.


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  • Dive Wellington
          432 The Esplanade
          Island Bay
          Wellington 6023
          New Zealand
  • +64 (4) 939 3483 
  • +64 (4) 939 8101 

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Dive News: Thu 30 Aug 2018

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