TDI Technical Diving Crossovers

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TDI Advanced Nitrox & Decompression Procedures

TDI Helitrox

Students are permitted to utilise Enriched Air Nitrox and Helium mixes with no greater than 35% Helium content, and up to 100% oxygen for decompression diving provided the gas mix is within their current certification level. Breathing gas mixtures containing more than 35% Helium or less than 21% oxygen are not permitted.

Note 1 – 4 dives are required, 2 of those dives must be deeper than 30 metres. 

Note 2 – If Advanced Nitrox is taught in conjunction with Helitrox, a minimum of 6 dives are required. Check out the Advanced Nitrox and Helitrox course.

TDI Close Circuit Rebreather Helitrox


Note 1 – If a student already qualified as TDI Helitrox Diluent Decompression Procedures CCR Diver or equivalent from agencies recognised by TDI and wish to qualify on another CCR recognised by TDI, the student must follow all unit specific course standards with the exception of: 

A – Minimum of 60 minutes confined water training to a maximum of 9 metres.

B – Minimum of 240 minutes open water training to be completed over a minimum of 4 dives to a maximum of 45 metres with two dives deeper than 35 metres. 


Note 1 – If a student has already qualified as a TDI CCR Air Diluent, or equivalent, certification and wishes to do the Helitrox decompression part of this course, only 240 minutes open water are required. Students will complete a skills evaluation dive plus a minimum of 4 open water dives with two dives deeper than 35 metres. 

Note 2 – The student needs to have a minimum of 30 logged hours over 30 dives before enrolment on the Helitrox deco course 

Note 3 – Six months CCR diving experience 

Note 4 – If a student has the TDI CCR Air Diluent Decompression certification and wishes to do the Helitrox decompression part of this course, only 120 minutes open water are required over a minimum of two dives, with both dives deeper than 35 metres.

The course price for any of these options are available on request in discussion with your instructor. If you have any questions whatsoever, please do not hesitate to contact us to discuss, we are happy to assist.