Trimix Technical Diver (TDI)

As your motivation to explore progresses you may find you wish to go deeper to dive that historical wreck or cave system that you have read so much about. Alternatively, you may just want to continue your journey and learn new skills and techniques.

One of the limiting factors of diving deeper is gas narcosis; TDI’s Trimix Technical Diver course shows you how to minimise the effects of gas narcosis by using helium in place of a percentage of the nitrogen in your breathing gas.


During the 4 day Trimix Technical Diver course you will be shown how to competently and safely utilise how to plan for dives using helium in the back-gas, the limitations of using helium and the impact of helium on decompression.

Qualification Depth

60 meters maximum using Trimix as back-gas – Oxygen content no less than 18%.

Utilising up to 100% oxygen for accelerated decompression.

The Trimix Diver Course is performance based.


The technical diver training, provided by ScubaQuest, will certify students to the recognised international standards provided by Technical Diving International (TDI).

TDI (Technical Diving International)


The course is completed over four days with a minimum of four dives below the depth of 30m, two of which will be below 40m with a minimum accumulated bottom time of 100 minutes.

Due to the nature of the course a flexible and personalised approach to the schedule will be applied based on the previous experience and pace of the student.


Technical Courses by their very nature require a tailored approach and in some cases the need to have a minimum number of students participating to make the course an effective learning experience.  Technical courses will be scheduled based on demand and customer requirements.

Please contact ScubaQuest to discuss scheduling options.


ScubaQuest Dive Centre
National Diving & Activity Centre
A48, Tidenham
NP16 7LQ

Map & Directions to ScubaQuest

Course Options

A complete equipment list will be issued as part of the booking process. Where required, additional equipment can be supplied for the duration of the course at extra cost including twinset, regulators and stages.

ScubaQuest offers both traditional hard copy, classroom based theory and agency online learning packages.



The cost for the course includes agency manual, certification and use of O2/He analyser.

Gas fills are excluded.

Please Note: For open water dives at The National Diving & Activity Centre (NDAC) there is a daily entry charge to the site, payable on the day by all students. This is NOT included in the course fee.  Please check the NDAC website for details.

Course Requirements & Notes

Book this Course

To book on this course or to discuss scheduling, please contact us using the form below, or phone us on 01291 798 118

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TDI (Technical Diving International)
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SDI TDI Professional Development Centre
Development Centre
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© 2018-22 ScubaQuest Ltd. All rights reserved
Built by Studio JERO
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