It is the first course of technical diving. During the course you will dive with air, various nitrox and decompression mixtures of up to 100% oxygen, at depths between 30 to 51 meters. You will also expand your knowledge of decompression theory and learn more about different theories of nitrox and oxygen use. For advanced dive planning, several PC decompression programs and tables are used.

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

Theory
Land Drills
Confined and Open Water Training
Dives with 3 different gases
Final Exam

Minimum 5 days (in combination with Deep Air and Advanced Nitrox minimum 8 days)
8 Hours theory
5 Dives (in combination with Deep Air and Advanced Nitrox Minimum 10 dives)
1 Training dive in shallow water

Maximum depth 51m / 170 ft
Decompression stops are performed with 100% oxygen, or 50% and higher
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
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 1 drysuit
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