IANTD Trimix Diver Course


This Program is designed for those individuals already involved in deep diving activities, but is not intended to be used as an enticement to divers who are content to remain in Sport or EANx diving limits.
Trimix affords a safer means for deep-water exploration for divers who dive deep or perform with a clear head at depth. The IANTD Trimix Diver Program requires the diver to be self-sufficient/reliant.
The knowledge and skills taught in this program are more than adequate to qualify divers to perform Trimix Dives outside of training up to 100 msw.


Must be qualified as an IANTD Technical Diver or Technical Cave Diver or Technical Wreck Diver or Normoxic Trimix Diver or equivalent.
Must provide proof of a minimum of 200 logged dives, of which at least 25 were to depths between 42 msw and 60 msw or sufficient experience doing technical dives to satisfy the instructor that the student has the ability and knowledge to continue into this level of training.
Must be a minimum of 18 years of age.

Program Content

All lectures completed with IANTD Course-specific Slides pertaining to the theory in the IANTD Trimix Diver Student Kit.
Perform two skills-training dives following completion of the confined water session(s) add in and a total of 4 dives will be conducted in this course with a minimum in which two stage cylinders are used, to a depth between 18 msw and 60 msw. These dives may be on air, EANx or Trimix provided the depths are acceptable for the gas used, and two gas switches are practiced during ascent. Divers may not do dives on air deeper than 39 msw.
All depths must be worked up to incrementally with no increase greater than 12 msw from one dive to the next (the first dive in the course on mix must not be more than 10 msw deeper than the student’s previous experience in deep diving). One dive must be to at least 60 msw or deeper, and the deepest training depth may not exceed 100 msw.
All dives must include two gas switches.
Divers entering the Program on equivalent experience must complete the above requirements plus make two additional training (for a total of six training dives) dives using two stage cylinders. These two additional dives may be on air, EANx or Trimix at the instructor’s discretion.
If the course is a combined course (e.g., Technical Diver and Trimix Diver), the Program must include a minimum of 420 minutes of open-water run time completed within at least 7 dives.
To complete the course within the minimum specified dives. With 2 or more additional dives the student may graduate from the course with an overall average score of 6 points.

Equipment Requirements

IANTD Trimix Diver Student Kit.
Fulfill all Equipment Requirements as specified in the general Technical Diver Programs overview.

Program Limits

There may be no more than 4 students per Instructor on any dives, and no more than 3 students per Instructor on dives conducted to depths greater than 66 msw. The ratio for deeper dives may be increased to 4 students with an assisting IANTD Technical Instructor or Normoxic Trimix Instructor who is also a qualified IANTD Trimix Diver or a Trimix supervisor.
Dives up to 90 msw may be conducted during the course once 6 dives more shallow than 42 msw and 2 dives no deeper than 60 msw have been made, provided the student has completed 20 Trimix dives prior to the course.
No dives may be conducted to depths greater than 100 msw. Trimix dives may not be made to a depth less than 48 msw.
Equivalent Narcosis Depth (END) may not exceed 39 msw.
Surface oxygen must be available for use in the event of Decompression Illness (DCI).
All dives must be performed as a single dive team.
All appropriate safety or required decompression stops must be performed.
No dives made me made with a PO2 greater than 1.6 for decompression and 1.4 for bottom mix.

Water Skills Development

A confined water session must be completed before conducting any OW dives.
Two divers approximately 18 meters apart, locate each other while simulating an out of air situation (without breathing, and exhaling slowly) and begin gas sharing via long hose. After taking 3 breaths at rest, continue swimming at a normal rate while sharing gas for at least 2 minutes.
Simulate gas failure with valve shutdowns for both primary and secondary regulators. The entire drill must be completed in less than 1 minute. This drill should be completed at least once each dive, with a buddy acting as a safety diver, then switch roles. Upon completion of skill, verify both primary tanks are turned back on.
While swimming, demonstrate efficient switch to stage cylinder regulators.
Following a means of reference (pool wall, guide line, ship railing, etc.) with eyes closed, remove stage cylinders and swim a distance of at least 4.6 meters. Reverse direction, return to stage cylinders and replace them on correct sides, identifying each cylinder by feel.
Prior to dives, students must use IANTD Gas Management Charts to match gas turn points.
Remove and replace stage cylinders both at rest and while swimming.
Deploy and use a lift bag or up line at least once in OW.
Remove and replace equipment during confined water training (doubles and stage[s]), first on the surface, then on the bottom, in less than 2 minutes.
Simulate the rescue of a diver. Tow the diver on the surface for a distance of at least 12 meters while simulating mouth-to-mouth resuscitation. Go through EMS procedures and remove equipment from victim in the water (equipment removal must be accomplished in less than 1½ minutes, students in continuous webbing who cannot have their equipment removed within the time limit must add a quick release to their harness). Repeat until proficient.