TDI was founded in 1994 by Bret Gilliam, John Comly, John Crea, David Sipperly and Mitch Skaggs after a split away from International Association of Nitrox and Technical Divers (IANTD) in 1993 [REF].
In 1999, the International Training brand expanded their offerings by starting a sister organization known as Scuba Diving International (SDI) focusing on the sport side of scuba diving [REF].