Getting the ‘thumbs up' sign is probably the worst signal any diver can receive since it signifies that the dive has ended. Extending time, and sometimes depth, in water is probably every divers desire. The thrill of pushing the envelope and becoming an explorer is what drives many to become divers, and the Deco 50 course forms the basis and essential skills and knowledge needed to become an explorer.


          Deco 50 has been written with the new technical diver in mind. This means that divers wanting to participate in technical open circuit programs and who are certified in Deep 40, Master Rescue and Nitrox may bypass the Deco 40 program.


          The course has modern, graphic rich manuals which explore and introduce the most modern information and techniques. A modern skill set places emphasis on managing skill mastery while neutrally buoyant. The skills themselves have been up as well with desire being that RAID divers will use a similar equipment configuration and perform the skills in a similar fashion.



The program overview is as follows:

  • Dive to a maximum depth of 50 metres/165 feet.
  • Use any optional combination of air, nitrox, trimix and / or oxygen.
  • The END / EAD for trimix must not exceed 30metres / 100 feet.
  • Complete a maximum of 30 minutes accelerated decompression.
  • Divers may only utilise a single decompression gas.
  • Divers may use up to 100% oxygen for accelerated decompression.
  • Divers must use a multi-gas switch computer.
  • Bottom or back gas maximum PO2 is 1.4 and a maximum of 1.6 for accelerated decompression gas.
  • Certified to use air, nitrox, oxygen and trimix with a maximum END/EAD of maximum 30 metres/100 feet.






Decompression diving brings with it a new dimension. In the case of the Deco 50 course, depth is not increased but bottom time certainly


5 Days 8 Dives 

Day 1


Day 2 / Dive 1-2

Open Water – Minimum Depth 15m / 50ft - Maximum Depth 20m / 66ft Simulated Deco – 10 minutes of stop time at any depth
Dive  2  Minimum Depth 20m / 66ft - Maximum Depth 30m / 100ft Simulated Decompression Dive Minimum 3 stops – Total 11 minutes of planned simulated deco stops 3 stops at 12m ,9mand 6m Total stops – 10 minutes
  Or 3 stops at 9m, 6m and 3m / – Total stops – 10 minutes

Day 3 / Dive 3-4

DIVE 3 Open Water – Minimum Depth 30m / 100ft - Maximum Depth 40m / 130ft Simulated Decompression Dive Simulate decompression stops based on pre-cut plan using decompression software
Minimum 3 stops – Total 15 minutes of planned simulated decompression stops

Day 4 / Dive 5-6

Open Water – Minimum Depth 30m / 100ft - Maximum Depth 45m / 145ft Actual decompression dive, NO accelerated deco Decompression stops based on back gas, on pre-cut plan using decompression software Maximum of 20 minutes of planned decompression stops Switch to deco mix, but follow back gas schedule.
Dive  6 Open Water – Minimum Depth 30m / 100ft - Maximum Depth 45m / 145ft Accelerated decompression dive Maximum of 20 minutes of planned decompression stops

Day 5 / Dive 7-8


Open Water – Minimum Depth 40m / 130ft - Maximum Depth 50m / 165ft Accelerated decompression dive Minimum 20 minutes and maximum 30 minutes of planned decompression stops The instructor is encouraged to task the diver with problem solving during the dive considering diver safety.

DIVE 8 Open Water – Minimum Depth 45m / 145ft - Maximum Depth 50m / 165ft OPEN WATER TRAINING Accelerated decompression dive Minimum 25 minutes and maximum 30 minutes of planned decompression stops

Number of dives

8 Dives



18 years +

Maximum Depths

50 m. with deco dive 30 min 


Reason for Learning

The Deco 50 course builds upon the knowledge and skills from Deco 40. Divers will learn to carry and utilize an additional stage/deco cylinder as well as normoxic trimix to depths of 50 m/200 ft. Advanced dive planning techniques, multiple stage handling and unlimited decompression times are the highlights of this course using normoxic trimix and oxygen mixtures up to 80 percent o2.




- Be a minimum of 18 years old.
- Be a certified diver for at least 3 months.
- Be certified as a RAID Nitrox, Deep 40 and Master Rescue Diver (or equivalent), and have experience in Navigation and Night/Restricted Visibility diving.
- Must have logged at least 5 hours between 27-40 m.
- Submit current Rescue Breathing, CPR Training and Oxygen Provider certificates.
- Have logged 50 hours underwater or 75 dives using open circuit.
- Documented proof of prerequisite requirements must be presented to the Dive Centre for approval prior to any in water training.



There are 6 manuals and quizzes.
- Equipment
- Physics
- Physiology
- Management
- Confined Water
- Open Water
- Divers MUST participate in at least one confined water skill session and 8 open water dives.
- Dives from Deco 40 may credit towards Deco 50 certification.



Price : 45,500 THB Net Price (43,500 THB for groups of 3 or more)

Price included :

- Deco 50 certification
- All dive equipment
- Dive Instructor
- Lunch , Fruit , Soft drink on the boat

Price not included :

- Accommodation
- Transportation (Can be arranged)

How to book :

Please contact Thai Ocean Academy in any channel you prefer




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