Your chances of encountering a shark at BBBC (Bill Bushings Beach Club) aka CDP (Catalina Dive Park) are as equal to encountering a dangerous shark on the main street in your home town of Torrance.
I did read, I think on this board, that in 2014 more people were killed taking selfie pictures than sharks - so leave your camera at home.
However please bear in mind the water is the home of many sharks. You are an uninvited guest.
I would suggest that you read the thread immediately after this thread titled " SCUBA Radio -Farnsworth Banks first dive" It is a document of a dive that took place 55 years ago and the encounters with sharks.
The very last paragraph of the post is an encounter I had and didn't know I had until I was on the boat , which is a s follows:
~Or when you were followed to the boat by a rather substantial hammerhead. You were totally oblivious to it's presence. You just slowly took your time snorkeling back unaware that a large shark was interested in you as lunch. That is until you reached the swim-step and noticed that Dick Petter had his rifle pointed at you all the divers were congregated at the swim step with hands outstretched to yank you into the boat.
It was Sheila who later broke the tension when she said "Sam I was watching you play tag with that shark when I was eating a chicken for lunch --bones and all"
What adventures we had on every dive --"
Good Luck
SDM,111