This M'Pai Bay-based outfit has expert knowledge of the surrounding underwater world that only comes from years of experience diving here. Offers excellent one-day dive packages, various PADI courses (including Discover Scuba for US$95 and the three-day Open Water Diver for US$380) and longer three-day exploration dive trips for experienced divers. Also involved in local marine-conservation efforts.

The group runs Save Cambodian Marine Life and also the guesthouse Big Moon.