The TDI decompression procedures course is an exciting step further into your dive career. After your training, you will know how to plan and execute deep dives, stay longer underwater and perform mandatory deco stops safely.

Decompression Procedures

Can I take the Deco Procedures training in my recreational configuration?

At this level, you can still train in your properly configured recreational gear with just a single extra tank for the deco gas. Therefore you will only need an extra regulator and stage rig, and you can still join regular dive operations.

This configuration is a great option for going on a little deeper and longer dives while greatly increasing your safety, skills, and knowledge with minimal extra investment in dive gear, which is a great advantage.

I want to dive deeper and become a serious tech diver

If you are still a recreational diver but already know tech diving is for you, this course should be combined or follow an Intro to tech training (learn how to dive in a twinset) or a Side Mount course.

At Deep Dark Diving, all instructors have experience in technical diving in both configurations both in caves and in the ocean and can objectively answer any questions about the pros and cons.

Try dives in back mount or side mount configuration?

If you still have not made up your mind between back mount or Side Mount, Deep Dark Diving offers try-dives in both configurations.
One day per configuration, we discuss the advantages and disadvantages of the configuration in different dive environments.
We perform basic safety drills and discuss all the required drills during each course.
We go for a fun dive so you can get a real-life experience and a good feel for the experience.
You then know in detail what will be expected from you for an Intro to tech certification versus a side mount certification.

Is TDI Advanced Nitrox certification Mandatory?

Although not mandatory, you will get the best out of this Deco procedures training if you are already an Advanced Nitrox diver. You will be able to use mixes above 40% of oxygen for your deco, making it significantly shorter and more efficient. Of course, Deep Dark Diving offers the possibility to combine Decompression Procedures and  Advanced Nitrox.

The combination of Intro to tech or Side mount, Advanced Nitrox, and deco procedures training will be the foundation of all your future technical diving.

What’s in the TDI Decompression Proceduers Course


  • Longer bottom time
  • Safely execute decompression dives
  • Dive deeper
  • Look deeper into the decompression theory
  • Extend your diving techniques


  • 3 days minimum
  • Dives: 4 dives minimum (including 2 below 30 metres / 100 feet)
  • Adv. Nitrox + Deco Procedures: 6 dives minimum


  • Maximum depth: 45 metres/150 feet.

Course prerequisites

  • Minimum age 18
  • Minimum certification of SDI Advanced Adventure Diver, Advanced Diver, or equivalent
  • 25 logged open water dives
  • Recommended: Advanced Nitrox


  • Primary cylinder(s), Independent or isolated back-mounted
  • Decompression mix cylinder(s) (with submersible pressure gauge and Labeled)
  • Depth gauge and bottom timer and / or dive computer
  • Regulator(s)
  • Buoyancy compensator device(s) (BCD) adequate for equipment configuration
  • Line cutting device
  • Ascent reel with lift bag /surface marker buoy
  • Oxygen (O2) analyzer; may be supplied by the instructor
  • Exposure suit adequate for the open water environment
  • Underwater slate

What will you learn?

  • Choosing the Decompression gas
  • The use of dive Tables and personal dive computers
  • How to set Emergency and contingency plans  (in order to face equipment failure, omitted decompression, etc.)
  • Decompression diving procedures
  • Choosing the equipment and configuration
  • Pre-dive checks and drills
  • Stress analysis and mitigation
  • Following a decompression schedule
  • Gas switching
  • Team awareness and communication
  • SMB/lift bag deployment
  • Proper trim, buoyancy and finning techniques
  • Emergency procedures (in case of equipment failures, catastrophic gas loss, omitted decompression, navigational errors, etc.)
  • Equipment considerations, cylinder labeling, analyzing nitrox mixtures, and gas blending procedures

 What’s next?

Nitrox     Advanced Nitrox     Extended Range     Trimix