Most modern boats offer Nitrox membrane fills for $100–$250 per week. A few high-end operators include Nitrox in the price.
Yes — Nitrox is now standard on the vast majority of liveaboards worldwide, available either as a paid add-on ($100–$250 for unlimited weekly fills) or included in the base price on luxury and expedition operators.
How it works on board
Most modern liveaboards have a Nitrox membrane filling system that produces oxygen-enriched air on demand. The system filters atmospheric nitrogen out of the compressor intake, raising the oxygen percentage in the resulting tank fill. This is more efficient than the older partial-pressure blending method used by smaller operators and dive centers.
Daily protocol
Each Nitrox tank is analyzed before the dive using an oxygen analyzer. You write the oxygen percentage and the maximum operating depth (MOD) on a tag, log it in the boat's analysis log, sign for the tank, and set your dive computer to the correct mix. The crew handles the filling and analysis; you just verify and sign.
Common mixes
Nitrox 32 (32% oxygen) is the workhorse — it gives you 50–80% more no-decompression bottom time than air on most recreational dives, with a maximum operating depth of 33m at 1.4 PPO2. Nitrox 36 gives even longer bottom times but limits MOD to 28m, making it poor for sites with deep current entries. A few technical-focused operators offer Nitrox 50 or pure oxygen for staged decompression — these require Tec certification.
Cost
Standard add-on price is $100–$200 per week for unlimited fills. A few luxury operators include Nitrox in the base price (often advertised as 'Nitrox-inclusive'). Expedition operators in the Galápagos and Cocos almost universally include or strongly subsidize Nitrox because the dive schedule (4 dives a day at 25–30m for a full week) is impossible to safely complete on air alone.
Why it's worth paying for
Nitrox extends your no-decompression bottom time on virtually every dive. On a 25m dive, air gives you about 25 minutes of bottom time before hitting your limit; Nitrox 32 gives you 40+ minutes. Across a week of diving, Nitrox can add 30–50 extra minutes of bottom time per day. Equally important, you absorb less nitrogen, reducing your DCS risk profile and end-of-day fatigue.
Certification
PADI/SSI Enriched Air Diver is a 1-day course (2 hours classroom, 2 confined-water exercises, no open-water dives required) costing $150–$250. Once certified, you're certified for life. Get the course before your first liveaveboard.
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