Advanced Open Water Diver is the usual next step after Open Water Diver. PADI structures it as five Adventure Dives in open water, not a classroom-heavy repeat of your first course. You build experience by actually diving: deeper, navigating, and trying three more specialties you and your instructor choose.
Two dives are fixed. Every PADI Advanced Open Water course includes a Deep dive below normal Open Water limits and an Underwater Navigation dive. The other three might be night diving, peak performance buoyancy, enriched air, drysuit, photography or whatever the centre and conditions allow.
Most people finish in two to three days after eLearning at home. There is no big final exam. Your instructor watches how you plan, brief and execute each dive. When you qualify, certified divers aged 15 and over may dive to 30 metres with a buddy in conditions similar to their training.