The Professional Scuba Association International's Trimix Diver course is designed for those divers who wish to conduct dives using Helium based bottom mixes with associated advanced staged decompression techniques. The PSAI Mixed Gas diver program is conducted in three phases leading to dive depths of up to 100 meters. 

This course provides the necessary information for a PSAI Trimix Diver to know the proper procedures to:

• Determine appropriate gas for planned divers as well as the appropriate decompression gases. 
• Determine appropriate diving equipment for planned Trimix Dives.
• Plan dives based in established limits and cautions for diving gases.
• Analyze and verify all gases for Trimix Diving.
• Monitor and acknowledge the various effects of Gas Narcosis. 

A diver that successfully completes this PSAI Extended Range Nitrox Diver program will be qualified to:

• Plan and conduct Trimix dives to depths of 60 meters to 100 meters utilising helium based breathing gases and advanced decompression techniques.
• Evaluate the effects of Gas Narcosis for Mixed Gas Dives
• Obtain appropriate diving gasses for Mixed Gas Diving.
• Conduct Mixed Gas dives in environments and conditions that approximate those of training.