Divers used to standard air sometimes overlook nitrox as an option, but on a Galápagos liveaboard doing several dives a day, it can meaningfully change the experience. Enriched-air nitrox certification through PADI, SDI, or SSI is recognized and available to arrange as part of a trip, including certification completed onboard for divers who arrive without it.
The training itself covers the fundamentals any nitrox diver needs: understanding oxygen toxicity limits, respecting adjusted depth limits for a given gas mix, and knowing how to use an analyzer to verify the actual oxygen percentage in a filled tank before diving it. That verification step matters — divers are expected to check their own gas mix at the tank, not simply trust the label.
The payoff shows up across a full day of diving. Because nitrox reduces nitrogen loading compared to standard air at the same depth, divers typically get extended bottom time and can move through shorter surface intervals between dives. Over a day with multiple dives — which is the norm at sites like Darwin and Wolf — that adds up to less accumulated fatigue and more usable time in the water actually watching the animals that brought divers there in the first place.
Availability differs slightly by expedition type: on Galaxy Diver II, nitrox is included at no additional cost, while on the other boats it's offered to certified nitrox divers for an added fee. Either way, it's worth asking about ahead of a trip, particularly for anyone planning to dive multiple times a day for the better part of two weeks.
Source: adapted from Galápagos Shark Diving's own published article on nitrox diving in the Galápagos Islands.