We were there in April and while at shark/ray alley saw a bull shark, probably a 10 footer. It was just cruising around, not really by where the boats were chumming the nurse sharks and rays. None of the guides seemed to be concerned, and it really didn't seem to pay any attention to us. I got the impression that it wasn't the first time it had been spotted there. We have some really cool underwater video clips of it, once we get everything uploaded I am going to see if I can't find a way to post them.