This qualification represents a high level of competency for a technical diver. The diver is qualified to use up to two deco cylinders utilizing air, EANx, and/or oxygen to make extended, accelerated decompression dives.

• Depth is limited to 50m
• Prerequisites: 18 years or older, Tec 45 or equivalent, Rescue Diver certification, minimum of 100 logged dives, of which at least 20 dives were made with nitrox deeper than 60 feet, and at least 15 dives must be deeper than 100 feet