The SDI Master Scuba Diver Development Program was created to make truly “Master Divers”. The SDI – Master Scuba Diver Development program requires a new Open Water student to have a total of four (4) SDI specialties and the Rescue Diver course, along with having a total of fifty (50) logged dives. SDI feels a diver will truly be “Master Scuba Diver” after this is accomplished.