Advanced Nitrox.
EAN 21 through 100. The whole no-deco gas spectrum, twinset or sidemount, max 40 metres.
What this
course is.
Enriched air, properly. Beyond the recreational nitrox sticker, this course teaches the gas analysis, MOD/ppO2 maths and best-mix logic that lets you push bottom time without yet stepping past the no-decompression line. The foundation under every TDI deco course.
Honest about
the cohort.
- Divers heading toward Decompression Procedures and Extended Range.
- Recreational nitrox divers who want a tech-shaped understanding of gas.
- Anyone wanting to use 50–100% O2 within recreational depth limits.
Drilled until
it's boring.
Skills are not a list to tick — they are habits to build. We drill them on land, drill them in the shallows, then take them into the dive.
Best-mix maths
ppO2, MOD and CNS clocks. Done on paper before being done on a computer.
Gas analysis
Calibrate, analyse, label, sign off. Every cylinder, every time.
Multi-gas dive planning
Travel gas, bottom gas, deco gas — the logic of switching at depth.
Switch protocol
Switch by the numbers, never by feel. NOTOX. Confirm. Breathe.
Conservative computer use
Conservatism settings, gradient factors, multi-deco computer redundancy.
Gear for richer mixes
Oxygen service, dedicated regulators, cylinder protocols.
The shape
of the week.
Before
you book.
- Advanced Open Water with Nitrox or equivalent
- 25 logged dives
- Twinset or sidemount configuration (Intro to Tech recommended)
- Minimum age 18
In the
course price.
- Theory sessions and in-water training
- Use of analyser
- Twin-tank rental if required
- Course manual
Plan
for these.
- Certification fee
- Gas fills (charged at cost)
- Personal kit
- Insurance
Where this
takes you next.
Tech and cave are a ladder, not a catalogue. Here are the next rungs from this course.
Decompression Procedures
Past the no-deco line. Plan and execute staged deco to 45 m.
View course → Bundle itAdv Nitrox + Deco · Combined
The two courses together at a lower combined price.
View course → Or step into the overheadCavern Diver
First taste of overhead within the natural light zone.
View course →Make contact.
Send a short message with your goals and certification history. We reply within twenty-four hours and answer every question before you commit.