SSI XR Technical Extended Range


The SSI Technical Extended Range course

As a SSI Extended Range Diver you will show that you have developed competency as a tec diver and have the skills to dive to a maximum of 50m using AIR. You know how to safely and successfully make extended, accelerated decompression stops using up to two stage bottle with TWO different EANx gases up to 100% O2.

It’s not easy to reach this level and earning your SSI Technical Extended Range certification opens the door to deeper diving expeditions.  You can now continue on to complete TriMix training.

Successful candidates will not only be qualified to conduct decompression dives to a max depth of 50m, but more importantly, the course builds on skills learnt on the previous courses, so you will be comfortable using twins, but now will be managing TWO stage decompression gases.  You can then begin the SSI  Technical Extended Range Trimix course.

Why not look to book onto one of our diving trips to the Poor Knights or overseas such as Truk Lagoon to use your new skills.

Tech 50 Training - Dive Now
Tech 50 Training - Dive Now

What you will learn on the course:

  • Physics
  • Physiology

  • Hyperoxic gas mixes for decompression

  • Nitrogen absorption and elimination

  • Psychological aspects

  • Decompression Options

  • Technical Equipment – twins

  • Stage cylinder rigging and labelling

  • Dive Tables v Computers

  • Dive planning

  • Surface support

In water skills include:

  • Buoyancy control
  • Handling TWO stage bottles with TWO decompression gases
  • Gas switching as part of a team
  • Problem solving
  • Rescue skills

Cost: $1599 Based on 3 students | 6 days | Excludes charter trips to the Poor Knights Islands. 

Private courses for 1 person $3000 per person or 2 people $2300 per person available.


Cost includes all SSI training, certification and study materials. Any specialist equipment will be provided for the duration of the course.

If the students are continuing straight from SSI Extended Range with Dive Now, see in store for price.


We have found that candidates will get a lot more from their course if they have a strong foundation to start with. So having training and experience diving twin cylinders, plus the skill to back fin and hold their position in the water will aid them through this course and beyond.

About your Instructor

Simon has been an active technical diver since 2014. Since then, he has dived extensively in New Zealand and around the world. His Technical training was conducted in New Zealand by Tom Crisp and Andrew Simpson and his Tec Deep Instructor training by the legendary wreck and technical diver Pete Mesley.

He has been lucky enough to dive some of the worlds best wrecks and reefs – Wrecks including the WWII wrecks of Truk Lagoon, SS Coolidge in Vanuatu, our own Mikhael Lermontov in Marlborough, plus ex HMNZ Waikato and Canterbury here in Northland Reefs including Komodo National Park, Great Barrier Reef, Red Sea, Maldives, plus our own Poor Knights and Fiordland and many more.

Course Schedule:

  • Classroom theory sessions 2 × 4 hours
  • Confined water pool sessions 1 × 3 hours
  • Open Water Dives – 8 dives, with 2 of these being deeper than 40m.  These are usually at the Poor Knights, these will incur a charter boat cost.

Transportation is not provided by Dive Now Whangarei, but we do our best to help organise car pooling to the dive sites.

Required Equipment available for purchase or rent from Dive Now

  • Twin cylinders with Isolation Manifold
  • 2 x Stage cylinder
  • Wing and harness with suitable lift for diving conditions
  • Twin regulators with long hose configuration (DIN)
  • Stage regulator (ideally DIN)
  • 1x Mixed gas decompression dive computer
  • 1x Back up computer
  • Mask and Fins
  • Suitable exposure suit for depth and environment
  • 2 x DSMB and reels with appropriate for depth
  • 2 x cutting device
  • Wet notes
  • Primary light
  • Jon Line
  • Back up light
  • Back up mask

Future Opportunities

Once you complete the course, you will have plenty of opportunities to practice your skills on our regular dive trips. 

Opening Hours | Mon-Fri 8.30-5.00pm  | Saturday 8.30 – 1pm | Sundays Closed

© 2022 Dive Now All Rights Reserved.