There's been some diver deaths along the Cali north coast where the shark must have come out of nowhere. Two buddies diving and when one is facing away from the other for awhile then turns around, his buddy is gone except for a cloud of blood. A Great White probably. I dove those waters a lot for abalone. Never saw a shark myself, but I knew some people that did. One described a Great White that he saw as a couple fifty gallon drums leisurely kicking about. Often in murky waters with a long kick out from the beach, and a slow surface kick in with the heavy abs in a net within an inner tube in a Sea Lion's habitat. Often flopping about in the surge. I didn't much worry about sharks, must have been crazy. Sometimes wonder if one ever looked me over. Breaded and fried Abalone is mighty tasty though, and the big reds have a lot of flesh in them.