TDI Advanced Nitrox
Choose the Gas,
Control the Dive.
The TDI Advanced Nitrox course builds the skills that set up Deco, Extended Range, and Trimix.
Push beyond standard recreational diving limits safely and deliberately. TDI Advanced Nitrox teaches you to plan and execute extended no-deco dives and to switch between mixes of Enriched Air Nitrox from 21% to 100% O₂ underwater. Learn to calculate MOD/PpO₂, manage CNS and OTUs, program your computer correctly, and handle stage cylinders with safe, repeatable procedures. It’s the ideal step before the TDI Decompression Procedures, Extended Range, and Trimix courses.
Prerequisites:
Plus
- 18 Years Old
- 25 Logged Dives
- Basic buoyancy control
- Optional Buoyancy Workshop
Why train with Divers UnderGround?
Train with Divers UnderGround, and you will work with Instructor-Trainers who continue to explore, bringing field-tested methods into every session in the Riviera Maya. We keep teams small and standards clear, using structured land drills, in-water coaching, and video debriefs so feedback is specific and measurable. The cenotes serve as a natural classroom, with calm, high-visibility conditions that let you refine precision and build habits that hold under pressure. Our debriefs track what matters and compare plan vs. execution to create repeatable results. You won’t leave with a checkbox; you’ll go with a personal progression map toward Decompression Procedures, Extended Range, Trimix, Cave, or Wreck Diving goals, plus pragmatic equipment mentorship to ensure your configuration remains clean, efficient, and ready for what’s next.
What you can Do with this Certification
Dive EANx 21–100% O₂ on no-decompression profiles
Optimize plans for deeper or multiple dives
Apply Advanced Nitrox to recreational and future technical paths
Meet prerequisites for Decompression Procedures, Extended Range, Trimix, Technical Sidemount
Expand options for cave, wreck, and expedition objectives.
All within a fun, professional, and safe setting. You’ll train through real-world simulations, on land and underwater, applying from day one everything you need to become a dependable and confident Advanced Nitrox diver.
TRUE EXPLORATION ISN’T JUST ABOUT CROSSING THE THRESHOLD,
IT’S ABOUT COMING BACK TRANSFORMED.
What Skills
Will You Learn?
- Mix planning: optimal blends, MOD/PO₂, CNS/OTU tracking
- Gas analysis & labeling: analyzer use, logs, and cylinder management
- Computer setup: program O₂% and limits for Advanced Nitrox
- Dive planning: no-deco, extended, and multi-dive days
- Execution under load: trim, buoyancy, propulsion with stage/additional cylinders
- Stress & risk: calm control, hazard assessment, clear team communication
Course Details
Duration:
Minimum 3 days but we move at your pace.Take the time you need to feel confident and secure.
Dives:
1 open water dive and four cavern dives at a minimum of two different sites, plus land-based practice exercises.
Format:
Theoretical sessions, dry land simulations, and in-water drills with continuous feedback
Certification:
TDI Advanced Nitrox Diver
Training per day
USD 325
- Transportation from Playa del Carmen
- Nitrox 32%
- Cenote entrance fees
- Water, lunch, and snacks
E-learning Materials
USD 155
Digital Certification
USD 30
Optional: Add an extra day for technical skill reinforcement or fun diving/practice in the caverns or the Ocean.
The eLearning material and the certification fees are not included and must be paid separately.
To get the most out of your time with us, we recommend starting with the eLearning program before your in-water sessions. The certification fee is paid at the end of your training, once all requirements are met.
RELATED
COURSES
Yes, it’s technical. Yes, it’s demanding. But you’ve got to have fun!
TDI Advanced Nitrox
TDI Decompression Procedures
TDI Extended Range
