TDI is the largest technical certification agency in the world.  As one of the first agencies to provide training in mixed gas diving and rebreathers, TDI is seen as an innovator of new diving techniques and programs which previously were not available to the general public.  Training with TDI has provided divers with the opportunity to see such wrecks as the Andrea Doria, Lusitania and the Prince of Wales. 

TDI divers have explored underwater caves in Spain, Australia and Mexico and assisted as support divers on world record freedives done in the Red Sea.

SDI was created in 1998 and grew out of the success of our sister company TDI, which specializes in the more advanced disciplines of dive training.

Both students and instructors have embraced the no nonsense approach that the SDI training system offers. We have streamlined the course materials to let students study the essential academics with an emphasis on practical diving skills learned in both the pool and open water environments. SDI is the only scuba training and certification agency to require students to be taught with modern dive computers from the onset of training.

Scuba Schools International grew out of the passion of a few avid divers who were intent on making it possible for anyone to learn how to scuba dive.

For more than 45 years, SSI has provided training, scuba diving certification, and educational resources for divers, SSI professionals, and Training Centers and resorts around the world. Founded in 1970, SSI has expanded to include more than 30 Service Centers and is represented in more than 110 countries with over 3,000 international locations, with digital and printed materials in more than 30 languages.