"The first Cronulla Shark Island Swim was held in October 1987 on a drizzly overcast day. There was a medium swell running and the water surface was choppy. Sixty-four competitors swam from Cronulla Beach out to sea and around Shark Island and back to the beach; approximately 2.4 kilometres. There were no buoys and the competitors swam their own course causing many to have concern for their safety. There were no prizes but the race had already attracted some attention with long distance swimmer and Australian Belt Champion, David O'Brien winning the race."
You can read more about it here.
For me it has limited appeal... firstly because it contains the word "Swim" and secondly because it contains the word "Shark"