SCUBA DIVING UNIVERSITY / TRAINING
TDI courses & pathways
Explore technical foundations, open-circuit decompression, mixed gas, overhead and rebreather training.
10 core course guides · FAQs on every course
Choose a direction
These are learning directions, not automatic eligibility sequences. Specialties are choices; each course has its own prerequisites. Experience and assessment matter between steps.
Technical foundations and open circuit
Overhead branch
Rebreather branch
TDI · Technical foundations
Intro to Tech
Develop the buoyancy, trim, propulsion and team awareness used in technical training.
Course guide & FAQs →TDI · Open-circuit technical
Advanced Nitrox Diver
Study higher-oxygen gas use and the practical discipline needed for advanced gas management.
Course guide & FAQs →TDI · Open-circuit technical
Decompression Procedures Diver
Develop the planning and practical skills for staged decompression within the qualification’s limits.
Course guide & FAQs →TDI · Open-circuit mixed gas
Helitrox Diver
Introduce helium-containing gas use within a defined technical diving scope.
Course guide & FAQs →TDI · Open-circuit mixed gas
Trimix Diver
Develop mixed-gas planning and execution for appropriately experienced technical divers.
Course guide & FAQs →TDI · Advanced open-circuit mixed gas
Advanced Trimix Diver
Extend mixed-gas technical competence for divers who already have substantial relevant experience.
Course guide & FAQs →TDI · Overhead branch
Cavern Diver
Learn an introduction to overhead diving within the specific boundaries of cavern training.
Course guide & FAQs →TDI · Overhead branch
Intro to Cave Diver
Develop initial cave-diving skills within a deliberately limited training scope.
Course guide & FAQs →TDI · Overhead branch
Full Cave Diver
Develop fuller cave-navigation and emergency-management skills after the introductory foundation.
Course guide & FAQs →TDI · Rebreather branch
Air Diluent CCR Diver
Learn closed-circuit rebreather use on a specific approved unit within the course’s no-stop scope.
Course guide & FAQs →A selection of core pathways, not the agency’s entire catalogue. YouDive is independent and does not issue agency certifications. Explore the official TDI information ↗