PADI Tec Trimix 65
Introduce helium, reduce narcosis, and execute deeper decompression dives with precision and control
Overview
The PADI Tec Trimix 65 course introduces helium-based gas mixtures, allowing divers to extend depth while reducing narcosis and maintaining operational clarity.
Building on Tec 50, divers learn to plan and execute decompression dives using trimix as bottom gas, while managing multiple decompression gases and complex ascent profiles.
At N9BO℠, this is where divers transition into true mixed-gas technical diving — where precision, discipline, and gas strategy define safe execution.
Course Facts
- Course name: PADI Tec Trimix 65 Diver
- Level: Technical trimix (entry-level mixed gas)
- Minimum prerequisites: Minimum age 18, PADI Tec 50 Diver, Rescue Diver
- Ratio: Maximum 3 students per instructor (small groups recommended for quality training)
- Configuration: Full technical configuration (backmount doubles or sidemount) with multiple stage/decompression cylinders
- Depth / environment: Maximum 65m / 210ft with staged decompression and trimix bottom gas
- Format: Academic development + practical applications + open water decompression dives
- Duration: Typically completed in 5 days (5 dives)
What You’ll Learn
- Plan and execute decompression dives to 65 metres using trimix.
- Use helium-based bottom gas to reduce narcosis.
- Manage multiple decompression gases, including high-oxygen mixes.
- Perform advanced gas switches under increased task loading.
- Execute complex ascent profiles with staged decompression.
Prerequisites
- Be at least 18 years old.
- Hold PADI Tec 50 Diver certification (or equivalent).
- Hold Rescue Diver certification (or equivalent).
- Be medically fit for diving.
FAQ
Trimix is a breathing gas composed of oxygen, nitrogen, and helium. Helium is added to reduce nitrogen narcosis and improve clarity and performance at depth.
Tec Trimix 65 introduces helium-based bottom gas, allowing deeper dives while reducing narcosis, along with increased decompression complexity and stricter gas management.
Yes. Tec 50 may be conducted using trimix (helium-based gas) as part of the Tec 50 Trimix option. This reduces narcosis and improves diver performance at depth while maintaining the same maximum depth.
You will complete 5 dives, including one confined or limited open water session followed by four open water decompression dives.
You will be qualified to conduct trimix dives to 65 metres and progress into full Tec Trimix training, extending depth and complexity further.
Ready to Enter Mixed Gas Diving?
Send us your certifications and dive history. We’ll guide you into trimix diving with the structure, discipline, and precision required for deeper exploration.
Go Pro with PADI Tec Trimix Instructor
Advance into elite technical instruction with the PADI Tec Trimix Instructor rating. This qualification allows you to train divers in mixed gas diving and guide them through advanced decompression and deep technical environments.
