TDI Extended Range
Step Off The Grid,
stay on the plan.
Extended Range is about building time, control, and discipline on deeper profiles without Helium, guided by an instructor who treats the “umbral” with respect and a checklist.
This page covers Extended Range only, not Trimix.
Prerequisites:
Required Certifications:
- TDI Advanced Nitrox Diver.
- TDI Decompression Procedures Diver.
Plus
- 100 logged dives
- 25 dives deeper than 30 Metres / 100 Feet.
Why train with Divers UnderGround?
What you can do with this Certification
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 Extended Range diver.
UNDERWATER, THE WORLD DISAPPEARS. THE MIND NARROWS ITS FOCUS, AND BREATHING BECOMES EVERYTHING.
What Skills
Will You Learn?
- Deep dive planning to 55 m / 180 ft: build the dive, the ascent, and the “if-things-change” plan.
- Staged decompression execution: run stops with discipline and control, using nitrox mixtures and/or O2 for deco.
- Depth progression performance: complete deep training dives while keeping trim, buoyancy, and awareness stable.
- Lift bag/SMB from depth: deploy from depth and use it to conduct staged decompression.
- Stage cylinder procedures: manage two stage cylinders while holding position.
- Contingencies under pressure: respond to failures such as deco gas loss, schedule rebuilds, air-share ascents, and regulator failures.
Course Details
Duration:
Minimum 3 days but we move at your pace.Take the time you need to feel confident and secure.
Dives:
- 5 Dives, Two below 30 m/100 ft, Two below 40 m/130 ft.
- Maximum depth: 55 m / 180 ft.
- Configuration: Backmount or Sidemount (according to experience)
Format:
E-learning independent study, theoretical sessions, dive briefings and debriefings, and in-water drills with continuous feedback
Certification:
TDI Extended Range Diver
Training per day
USD 325
- Transportation from Playa del Carmen
- Air fills
- 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 caves** or the Ocean.
**Must be Full Cave Certified
The eLearning material and the certification fees are not included and must be paid separately.
High O2 mixes are not included in the price.
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
