Nautilus Scuba Diving is located near the centre of town in Port Vila. I did my PADI open water certificate here. The staff were very helpful and were very flexible with my course, letting me start on the same day I enquired.
They have a smallish swimming pool to learn skills in, which was well suited to the purpose. When I did my 4 open water dives, we went out on their boat, which is very well designed, and a much larger boat than some of the rival dive companies.
The dives I did were great; not too deep, as I was only just learning, and with heaps of fish. I saw barracuda, gropers, potato cod, trigger fish, parrot fish, wrasse, angel fish, butterfly fish, bat fish, puffer fish, a moray eel, an octopus, stone fish, nudibranch, anenome fish, ribbon fish and many more that I do not know the names of.
I was one-on-one with an instructor the whole time, so I felt very safe and secure. My dad (who has had his open water certificate for 27 years) came out on a dive too, and he was also impressed. They did some refresher skills with him, and he too was one-on-one with a divemaster.
I'm not an expert on dive equipment, but what they had seemed well cared for and in good condition.
Even when it was a dull and rainy day, the dive was warm and had good visibility, so diving is definitely a good option when the weather is not great in Vila.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.