Open water Diver The PADI Open Water Diver course is the world’s most popular scuba course, and has introduced millions of people to the adventurous diving lifestyle. The course consists of three main phases Knowledge Development (home study) to understand basic principles of scuba diving, 5 confined water dives to learn basic scuba skills and 4 open water dives to review your skills and explore! Course duration average of 4 days Prerequisites To enroll in the PADI Open Diver course or Junior Open Water Diver course you must Be 10 years or older Fit to dive