TDI Nitrox Diver
Dive Longer with
Enriched Air Nitrox
Want longer no-decompression limits with less post-dive fatigue?
The TDI Nitrox Diver course teaches you to plan and dive with Enriched Air Nitrox (EANx 22–40%), including cylinder analysis, correct labeling/logging, safe PO₂/MOD settings, and oxygen exposure tracking (CNS/OTU). It’s a clear, practical foundation for Advanced Nitrox, Decompression Procedures, Wreck/Deep, and exploration training, unlocking bucket-list objectives from iconic wrecks to manta and shark dives, and deeper cenotes.
Prerequisites:
Required Certification:
- Open Water Scuba Diver
- Or are you currently enrolled in an OWSD course
Plus
- 18 Years Old
- Or 15 years with written consent from parents or legal guardians
Why train with
Divers UnderGround?
Based in the Riviera Maya, our instructors teach both recreational and advanced technical divers. Training goes beyond theory: you’ll analyze and log fills, set safe depth limits, plan real Nitrox dives, and leave confident, integrating Enriched Air into your diving, anywhere in the world.
Building a pathway? We can bundle Nitrox Diver with Advanced Nitrox, Decompression Procedures, or Sidemount for a faster, structured progression.
What this certification lets you do
- Dive EANx 22–40% without direct supervision.
- Extend NDLs and often shorten surface intervals.
- Reduce nitrogen loading on multi-dive days.
- Apply Nitrox to both recreational and future technical profiles.
- Meet prerequisites for TDI Advanced Nitrox, Decompression Procedures, and more.
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 Nitrox diver.
TRUE EXPLORATION ISN’T JUST ABOUT
CROSSING THE THRESHOLD,
IT’S ABOUT COMING BACK TRANSFORMED.
What Skills
Will You Learn?
- Understanding Nitrox benefits, hazards, and myths
- Oxygen physiology and nitrogen absorption review
- Gas laws: pressure, partial pressures, and oxygen limits
- Using Nitrox tables and computers for EANx
- Gas analysis with an oxygen analyzer
- MOD calculation and oxygen exposure management (CNS)
- Proper cylinder labeling and logbook documentation
- Common Nitrox blending methods (overview)
Course Details
Duration:
3 Hours of E-learning theory review
Dives:
Two Nitrox dives are recommended, not required.
Format:
Independant study and review with a Divers UnderGround TDI Nitrox Diving Instructor.
To complete this course, you must:
- Pass the TDI Nitrox written exam.
- Demonstrate oxygen-analysis proficiency for EANx.
Certification:
TDI Nitrox Diver
Theory Review &
Practical Application
USD 65
- TDI Nitrox E-learning theory review
- Plan a Nitrox dive with TDI Tables using EAD.
- Write a simple plan with MOD set to 1.4
- Use an oxygen analyzer correctly.
- Manage and label cylinders
- Set your computer O₂% correctly.
E-learning Materials
USD 155
Digital Certification
USD 30
Optional: In-water dives let you feel the real benefits of Enriched Air Nitrox (EAN), longer NDLs, and more energy after the dives.
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
