Become a CCR Hypoxic Trimix Diver

The SSI CCR Hypoxic Trimix program provides divers with the knowledge and experience required to independently plan and conduct unlimited trimix decompression dives to a maximum depth of 100 meters using a closed-circuit rebreather and a minimum of three bailout cylinders. This in-depth closed-circuit rebreather diving program is both physically and mentally challenging, holds the highest level of accolade in the industry, and reflects your commitment and experience as a diver.

With safety at the forefront of the SSI training philosophy, this unit-specific program will provide more in-depth academic topics such as gas density, team bailout protocols, and expedition procedures to enable safe diving. This unit-specific program is available on the rEvo, SF2, AP Inspiration, Poseidon, Prism 2, or JJ rebreather and only uses trimix as the breathing gas to reduce gas density.

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Facts and Training Standards

Amount of Academic Sessions



Amount of Pool/Confined Water Sessions



Amount of Open Water Sessions



Maximum Training Depth


100 m / 330 ft

Suggested duration (h)




Deeper, further and longer

Here are the benefits you can expect from attending this training program:

The apex of CCR diving

Take your teamwork skills to the extreme

Gain the skills and experience required to make expedition-level dives

Take your Rebreather Training Further

As a certified CCR Hypoxic Trimix diver, you earned the most challenging closed-circuit rebreather diving certification in the industry. Your unit-specific training on the rEvo, SF2, AP Inspiration, Poseidon, Prism2, or JJ rebreather can take you into nearly any underwater environment.

Expand your rebreather diving to explore the overhead environment with SSI’s Cave Diving and Wreck Diving programs. Or, try a semi-closed rebreather with the SCR Extended Range program. With our range of rebreather diving programs, there are no limits to your diving ambitions and goals.

More Information

Training Prerequisites

SSI Entry-Level Programs – Open Water Diver, Freediver, or Mermaid require students to complete a water fitness evaluation prior to open water training. The goal of this evaluation is to determine a comfort level baseline consisting of:

Swim Assessment

Survival Float

Technical Requirements

To start training, students must create a MySSI profile. This can either be done via the SSI website at or by installing the MySSI App.

Simply download the app for either iOS or Android, set up the user profile, and access the world of diving in minutes! The MySSI App safely stores everything in one place, online or offline – training materials, logbook, and certification cards. This includes Recreational Scuba, Extended Range, Freediving and Mermaid.

Training Center Selection & Affiliation

Every student must select an SSI Training Center as their “Training Partner” during the course registration process. Affiliation ensures personalized service and a high-quality training experience.

Students can also change affiliation or choose to affiliate with multiple Training Centers in their user profile. When affiliating with a Training Center online or via the MySSI App, a Privacy Policy Agreement will be processed to comply with GDPR regulations.

Medical & Administrative Requirements

Each student or candidate must complete the required SSI Training Record Forms prior to participating in any SSI training program. The forms for minors must be reviewed and signed by a parent or guardian.

Responsible Diver Code

SSI Responsible Diver Code - Scuba DivingSSI Responsible Diver Code - FreedivingSSI Responsible Diver Code - Extended Range Diving

Diver Medical Statement & Questionnaire or Physician’s Approval to Dive (where required)

Training Assumption of Risk, Liability Release, & Liability Release, & Hold Harmless Agreement (where required / not applicable within the European Union)

Program-specific Completion Record (done by the Instructor prior to certification)

Training Course Costs

Training consists of various components which are either charged singly or as a package depending on the selected Training Center. The components are:

Training Materials / Digital Kit

Tuition for Academics and In-Water Training

Open Water Training Dives


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