The PADI Advanced Open Water course is the next step for divers with Open Water certification.  There's some independent studying, a short classroom session, and 5 Adventure Dives.  You'll make an Underwater Navigation dive, a Night dive, a Deep dive, and two Elective dives.  You can choose the Adventure dives for your Electives from most of the specialty dive topics:  Boat, Drift, Enriched Air, Dry Suit, Underwater Photography, Diver Propulsion Vehicle, Search & Recovery.  (some adventure dive topics  require special equipment which must be purchased or rented, and some can only be completed on one of our tropical dive trips.)