Veteran amateur rock lobster fisher Luke Kuhn has lived up to his nickname "Lucky Luke" after surviving a great white shark biting onto his swim fin yesterday and dragging him along the ocean floor.Mr Kuhn, along with his diving buddy Daniel Field, set out to dive for lobster at a local spot they know well at Cape Jaffa on the Limestone Coast in South Australia.The pair noticed a seal hanging around the boat when they anchored, but did not think much of it.Mr Kuhn descended to about 12 metres, where visibility was poor — less than 2 metres — and 10 minutes into his dive "all hell broke loose"."I was reaching under a shelf for a cray, then all of a sudden I'm getting dragged backwards along the ocean floor by something powerful, very powerful," he said."The shark had my fin I was right next to his head."I managed to get my foot out of the fin and I swam back to my spot to get my loop in case he came back."The shark then surfaced, barrel-rolled and seemed to be heading back for round two, but Mr Kuhn managed to elude it, making his way to the surface to alert his dive buddy."I was in a bit of shock trying to work out what happened, but made my way to the top and just yelled to my mate to come get me," he said."He was at my side within seconds, and said my face was pure white."Back onboard, the pair reported the encounter to Shark Watch SA."Within hours, my cousin in Switzerland is calling me