TDI Decompression Procedures
From Bottom Time
to Ascent Strategy
Plan, calculate, and execute staged decompression dives with intent and control.
Deco Procedures (to 45m/150ft)
Push beyond no-decompression limits, safely and deliberately. With the TDI Decompression Procedures course, you learn to plan, configure, and execute dives with mandatory decompression stops using appropriate gases and disciplined ascent control. It’s the foundation for deeper, longer, and more complex objectives, and the bridge to the TDI Extended Range and Trimix courses.
Prerequisites:
Required Certification:
Advanced Adventure Diver (or equivalent).
- Can be combined with the TDI Advanced Nitrox course.
Plus
- 18 Years Old
- 25 Logged Dives
- Basic buoyancy control
Why train with Divers UnderGround?
You’ll work with instructors who actively dive with actual objectives in the Riviera Maya, bringing field-tested procedures into every session. We keep ratios tight, structure land drills and in-water coaching for measurable outcomes, and debrief with clear, data-driven feedback. Cenotes and open-water sites provide the perfect depth profiles and conditions to refine gas planning, ascent control, and contingencies until the process is calm and repeatable, skills you’ll carry into Extended Range, Trimix, Cave, and Wreck projects.
What you can Do with this Certification
Plan and conduct dives with mandatory decompression stops
Use air, Nitrox, and oxygen for decompression (as appropriate)
Reach deeper routes in caves, wrecks, and technical reefs with control
Start advanced courses: Extended Range, Trimix, Advanced Wreck
Join technical projects and expeditions with greater autonomy and safety
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 Decompression Procedures diver.
WHILE OTHERS SEEK THE SURFACE,
WE EXPLORE WHAT LIES BENEATH.
What Skills
Will You Learn?
- Decompression planning: gas choice, runtime building, contingency profiles
- Gas management: consumption calculations, MOD planning, staging for bottom and deco mixes
- Ascent control: stop discipline, SMB deployment, team positioning
- Emergency management: gas loss, equipment failures, missed/skipped stops
- Tools: using computers and tables (including gradient factors) for deco
- Human factors: stress evaluation, teamwork, decision-making under pressure
Course Details
Duration:
Minimum 3 days but we move at your pace.Take the time you need to feel confident and secure.
Dives:
- 4 open-water dives, two below 30 m/100 ft.
- Maximum depth: 45 m / 150 ft.
- Configuration: Backmount or Sidemount (according to experience)
Format:
Theoretical sessions, dry land simulations, and in-water drills with continuous feedback
Certification:
TDI Decompression Procedures 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
