This course is for the ambitious diver who wants to descend to depths between 39 – 60m with an open circuit system. This course will focus on the use of helium mixtures. They reduce the amount of nitrogen and allow you to dive deeper while abating narcosis.

18 Years old
IANTD Advanced Nitrox Diver or equivalent
100 Logged dives, 30 deeper than 27m / 90ft

Theory
Land Drills
Confined and open water dives
Dives with 3 different gases
Final Exam

Minimum 5 days
8 Hours theory
4 Dives
1 Training dive in shallow water

Maximum depth 60 m / (200) ft
Decompression stops can be performed with 50% or higher oxygen content
Maximum oxygen partial pressure of 1.4 ATA at depth
Maximum oxygen partial pressure of 1.6 ATA for decompression
All dives are kept within the limits of the IANTD Oxygen CNS% Clock and OTU’s
The Equivalent Narcosis Depth (END) shall not exceed 36m / 120ft
4 Students per instructor

Twin tanks with manifold and isolator valve
3+ Independent regulators with first and second stages
1 With long hose (2m/7ft.) and LPI
1 With short hose (~55cm/22 in.) and SPG
1 O2 clean with a meter hose and oxygen pressure gauge
1 Regulator per stage tank with meter hose and SPG
1 Decompression tank for 80% or 100% oxygen, clearly marked and labeled
1+ Nitrox Stage Tanks with at least 1,400 free litres / 50 cf.
2 Wing units, or 1 wing and 1drysuit
A lift bag with at least 22.5 kg / (50 lb) buoyancy
Wetsuit
Mask and fins
2 Line cutters
1 reel with a minimum of 40m of line
Dive computer, or stopwatch and depth gauge
Writing board, or wet notes
Waterproof diving table, or second dive computer
3 Directional arrows
Compass