Who is SDI? SDI was created in 1999 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 agency to require students to be taught with modern dive computers from the onset of training.


SDI course materials are state-of-the-art; the materials are lavishly illustrated with photography and graphics.


Diving is constantly changing. SDI staff is always looking forward and striving to be the innovators in scuba diving education. SDI focus is to make the experience of diving one that is enjoyed by every family member.


SDI staff are all active divers; and want to share the love of the sport.

Who is TDI? 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, Luisitania 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.


TDI’s professionals are held to the highest standard to ensure quality training throughout the world. This means that as a diver taking a TDI course, your instructor will have documented his experience and knowledge prior to achieving that rating. As an instructor candidate taking a TDI course, your TDI instructor trainer will have gone through the paces to achieve the highest level of training that TDI offers.


TDI is committed to offering the highest quality training supported by the latest materials with the most up to date information and techniques. TDI’s materials are written by authors that acutely conduct the type of diving they are writing about. Those same materials are update as technology and equipment change.






IANTD is the only EANx agency that offers training in all aspects of EANx through continuing education programs. This allows you to expand your knowledge and training with the top professionals in the field. IANTD instructors are well trained, highly experienced and extremely qualified. IANTD Standards and Procedures provide for the highest level of EANx education and training available. IANTD (IAND, Inc.) was founded by Dick Rutkowski, the former dive supervisor for the National Oceanic and Atmospheric Administration (NOAA). Mr. Rutkowski introduced the recreational diving community to the technology of EANx. This program was developed through NOAA during his tenure. Today the board of directors and the membership of IANTD are composed of many of the most experienced divers in the world pertaining to the use of breathing gases other than air.

DSAT TecRec courses provide the techniques and procedures necessary for diving beyond recreational dive limits. These are some of the most intensive, yet exhilarating, courses you’ll find.


Technical diving isn’t for everyone but if this type of diving appeals to you and you’re willing to accept the risks, responsibilities and obligations, you’ll find it one of the most rewarding dive experiences you’ll ever have.