Completion of 4 SDI, TDI, or ERDI Specialty Courses or equivalent; only 1 course without dives, may be credited towards the master diver development program, with the exception of nitrox Logs 50 dives SSI SSI awards their Master Diver Recognition to any diver who completes: any four different SSI Specialty Diving courses SSI Diver Stress & Rescue course Logs 50 dives Footnotes Diving qualifications