I've worked with all sorts of big animals but there is always the feeling that you have a "fighting chance" if things turn nasty. I do not feel like that with a shark . Granted, I have no experience with ocean animals or deep sea diving but just watching that big mouth full of teeth circle around your man made shivers go up and down my back! Not to mention the flip side to swimming with firendly sharks - whole limbs being suddenly snapped off! (Oooh more shivers)!