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
YouDive mascot illustration for TDI courses & pathways; not an instructional demonstration
TDI is a technical training agency. Start with an appropriate recreational qualification and experience; its sister agency SDI offers recreational training. Cave, open-circuit and rebreather qualifications are separate branches with their own entry requirements.

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.

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 ↗