I commonly hear people mention around here that one thing they like about diving in BC is that there are no big sharks. I've seen online somewhere that the great white has been spotted all the way to Alaska and there has even been video documented where orcas were attacking a great white close to vancouver island! I'm wondering if any shark experts could comment on this and if they do indeed live this far north. Is there a reason why these sharks are seen so commonly in shallow warm waters but not in the colder climates?