This advanced technical diving programme qualifies you to conduct extended-range dives to a maximum of 50 metres using two decompression gases. You will refine high-level planning, gas management, emergency skills, and multi-stop decompression techniques, building the competence and discipline required for deeper and more complex technical environments.
The Tec 50 programme deepens your understanding of decompression theory, advanced gas planning, and multi-cylinder management. You’ll begin with five knowledge development sections that review decompression obligations, oxygen exposure limits, gas switches, and the operational discipline required for extended-range dives. These lessons directly support the four practical application sessions where you will configure your equipment, conduct pre-dive checks, analyse gases, and prepare for staged decompression work.
The open-water sessions involve four progressively complex training dives. You will practise multi-stop decompression ascents, controlled gas switches, and navigation tasks while maintaining precise trim and positioning at depth. Each dive reinforces planning accuracy—using two decompression gases—and focuses on coordinated execution with your team. Past 40 metres, gas consumption, narcosis awareness, and redundancy procedures become essential, and you will learn how to manage these intentionally and efficiently.
Emergency training forms a core part of the programme. You’ll practise malfunction responses, lost-gas scenarios, cylinder failures, and procedures requiring decisive action. By the end of the course, you will be able to conduct extended-range dives to 50 metres using multiple decompression gases and will be prepared for future progression, including full Trimix training.
Initial preparation takes place in controlled-water sites that allow you to rehearse gas-switch protocols, buoyancy adjustments, and cylinder handling without external interference. These sessions ensure you are fully comfortable with equipment placement, hose routing, and emergency drills before moving into deeper training environments.
The open-water dives are carried out at sites with suitable depth, stable visibility, and room for multi-stop decompression ascents. These locations provide predictable topography, allowing you to perform gas switches, staging procedures, and extended ascents safely and consistently. Facilities at the site support pre-dive planning, gas analysis, and structured briefings.
You must be certified as a Tec 45 diver or equivalent and have completed recent CPR and First Aid training. A minimum of 100 logged dives or 75 dive hours is required, demonstrating sustained experience and familiarity with deep-water environments. A medical form signed by a doctor within the last 12 months is also mandatory.
Divers should arrive comfortable with decompression procedures, buoyancy stability, and equipment redundancy. Completing all e-learning before in-water sessions ensures you are fully prepared for the planning and decision-making required at this level.
Training is delivered by instructors with extensive experience in extended-range and multi-gas technical diving. Their structured approach reinforces safe practices, precise planning, and methodical skill progression. Each task is introduced in a clear sequence, allowing divers to build confidence and autonomy at depth.
The environment prioritises professional standards, well-maintained equipment, and supportive team-based learning. You’ll gain the competence needed for deeper, more demanding environments while developing the mindset required for advanced technical pathways. This course represents a significant step toward full Trimix diving and expedition-level dive planning.
About the centre
The Palm Jumeirah, Dubai
We partner with Rewilding Britain to help protect our natural spaces for future adventures.
All centres are vetted for safety and quality. Your adventure is in good hands with adventuro.
Thiladhunmathi Uthuruburi (Haa Alifu), Maldives
From €2255
Riviera Maya & Caribbean Coast, Mexico
From €2145
