The Tec Trimix 65 is the first level trimix course open to certified Tec 50/Tec Deep Divers. The DSAT Tec Trimix 65 course introduces Tec 50 divers to the first stages of trimix diving to a maximum depth of 65 metres/210 feet. Certified Tec Trimix 65 divers are qualified to make multi- stop trimix decompression dives that employ EANx and oxygen for accelerated decompression, and trimix with 18 percent or more oxygen as bottom gas.

What Does It Mean To Me?

You will learn to:

  • Analyse Trimix gas and mark cylinders.
  • How to plan Trimix decompression diving using desktop deco software
  • Execute trimix dives to 65 metres with a maximum 18% oxygen in backgas and using a maximum of 2 decompression gasses to accelerate your decompression
  • learn motor skills required for Trimix diving
  • Learn how to plan for and react to underwater emergencies.

Course Schedule / Duration

Can start course any day, 6 days

Day 1 : Knowledge Development 1, 2, 3 & 4 / Practical Application 1, 2, 3 & 4 / Exam

Day 2 Assessment Dive & Training Dive 1 with Rescue Skills

Day 3 Training Dive 2 an air dive to 27 meters minimum & 50 meters maximum

Day 4 Training Dive 3 a Trimix dive to a minimum of 30 meters and a maximum of 50 meters

Day 5 Training Dive 4 a Trimix dive to a minimum of 40 meters and a maximum of 55 meters

Day 6 Training Dive 5 a Trimix dive to a minimum of 45 meters and a maximum of 65 meters



  • Be a PADI Rescue Diver (or hold a qualifying certification from another organization)
  • Be a DSAT Tec 50 or Tec Deep Diver (or hold a qualifying certification from another organization)
  • Have a minimum of 150 logged dives
  • Be at least 18 years old
  • Signed medical form physician stating that you are fit to dive


5 boat trip (6 dives) including lunch/refreshments

Local Price: 45,000 baht
Standard tec rig rental 5000 baht for the course.
Tec Trimix Diver manual (which can be used for both Trimix courses) : 4,000 baht
Helium at 2.25 baht per litre: approx 13500 baht
Oxygen at 0.3 baht per litre: approx 1500 baht