I have seen some photos posted from tourists who appear to be snorkelling right alongside full sized black tipped reef sharks on Koh Tao and I wondered if this is a safe thing to do?. I must admit it looks like it would be a cool experience. I looked up these sharks on wikipedia and it warns that they are regarded as potentially dangerous but seldom pose a danger to humans unless roused by food. Apparently most attacks are non lethal and consist of bites to feet and legs. I would appreciate some feedback.