Master the Deep: SSI Technical Extended Range Trimix Instructor Seminar The Technical Extended Range Trimix Instructor program is the next logical step in your evolution as a technical dive professional. Designed for instructors who strive for excellence, this course trains you to train divers for complex decompression dives with up to two gas changes and a maximum depth of 60 meters. Focused on the use of Trimix to optimize safety and mitigate inert gas narcosis, this seminar redefines your teaching standards. For regions with limited access to helium, we also offer the Technical Extended Range Air certification pathway. Elevate your career and lead the next generation of technical divers. Start your training today.