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.
Learn technical diving with SSI
SSI has developed specific training materials with exciting, cutting-edge manuals developed by industry professionals with decades of technical diving experience. As with all SSI programs, Extended Range is designed to fit your schedule. Training is flexible to match your goals and objectives. With theThe range of open-circuit programs provides training in either sidemount or twinset configurations, meaning you can develop your skills up to a maximum depth of 100 meters. During your program, your instructor will cover everything including supreme buoyancy, propulsion, equipment management, and effective decompression. Learn how to extend your dive times by joining the growing community of Mares Horizon semi-closed rebreather divers. With both no-decompression and decompression diving programs available on this light-weight simple unit, you will never look back to blowing bubbles again.
SSI´s training programs are globally recognized, and ISO certified. A progressive approach to personalized training and a close cooperation of all SSI affiliated Professionals and Training Centers and Resorts around the world ensures you will get the best training possible!
Digital Learning & Academics
SSI has mastered the use of digital technology to make your learning experience easy.
You can start by studying the academics anytime, anywhere at your own convenience and your selected Training Center will schedule your review and in-water training sessions.
During the pool/confined water training, your SSI Instructor will teach you all the necessary skills in a controlled environment until you are comfortable and ready to go to the open water. During the open water training dives, you will apply your knowledge and repeat the skills in a real-world environment under the supervision of your Instructor.
Once you have completed all required training sessions, final exam and open water training dives, your SSI Training Center will issue your digital certification card which will show up instantly on your MySSI App.
We congratulate you on your accomplishment and welcome you to SSI’s global diving community.
Facts and Training Standards
Amount of Academic Sessions
Amount of Pool/Confined Water Sessions
Amount of Open Water Sessions
100 m / 330 ft
Maximum Training Depth
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
Register free and start training right away!
To get started, simply create a free user profile at www.divessi.com/register or directly through the MySSI App and you will get immediate access to SSI’s free trial programs. During registration you will need to select an SSI Training Center to affiliate with to guide you through the training process. Just check the Center Locator for your Center of choice, their upcoming training schedule, travel, and social events, and much more.
Simply download the MySSI App from your preferred app store, set up your profile, and discover the world of diving with the following benefits:
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.
Do you want to explore iconic towering shipwrecks and dive World War airplanes covered in vibrant marine life? Discover the world of wreck diving and get started today with the SSI Wreck Diving Specialty program.
Go further than you ever have before and experience the thrill of underwater cave diving. Learn to explore caves with a single navigational choice in the SSI Cave Diving program. Join the exciting world of technical diving today!
SCR Extended Range (HORIZON)
Advance your rebreather training with SCR Extended Range. Maximize your semi-closed rebreather dive planning, go deeper, sharpen your rebreather diver skills, and strengthen teamwork. Use the Mares Horizon rebreather for this ultimate adventure!
SSI Entry-Level Programs – Open Water Diver, Freediving Level 1, 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:
To start training, students must create a MySSI profile. This can either be done via the SSI website at www.divessi.com/register 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.
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
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
Technical Diving Featured Destinations
Try a range of dive styles, improve your skills and get the experience you need to explore the world’s best dive sites. Whatever your dive passion, we have an SSI advanced training program for you. Get your SSI Specialty certifications to become a safe and comfortable diver.