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Gatquatic Divers Club was founded in 1974 by George A. Tinnerman III. The name "Gatquatic" stems from the founder and first head coach's name. Using his initials G.A.T. and combining them with "aquatic" formed the now familiar "Gatquatic".

In 2006, George A. Tinnerman III was awarded the Syl Apps Award for volunteerism in Ontario. This award is presented by the Sport Alliance, in partnership with the Province of Ontario and the Ministry of Health, honouring those who have made significant contributions to their sport as leaders in their Province.