SSI (Scuba Schools International) was founded in 1970 and is the world’s largest professional business-based diving training agency, with over 4,000 Training Centers and more than 100,000 SSI Professionals in 150+ countries. SSI certifications are recognised globally by the RSTC (Recreational Scuba Training Council), EUF (European Underwater Federation), and diving authorities worldwide. All training materials and certification cards are managed through the free MySSI App, giving students digital access to their records anywhere in the world. This guide covers all SSI courses from Try Scuba through to Divemaster — including the full specialty programme.