The Niagara Divers Association is a fun, open minded group of active divers, too. Plus they host the annual Shipwrecks symposium:

"The Niagara Divers' Association will present its 18th Annual Shipwrecks Symposium, "Shipwrecks/2012" on Saturday, March 31, 2012 at Centennial High School, 240 Thorold Road, Welland, Ontario.

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